862 lines
38 KiB
Python
862 lines
38 KiB
Python
# Copyright (c) 2014-2015 Brett Cannon <brett@python.org>
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# Copyright (c) 2014-2016 Claudiu Popa <pcmanticore@gmail.com>
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# Copyright (c) 2015 Pavel Roskin <proski@gnu.org>
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# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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# For details: https://github.com/PyCQA/pylint/blob/master/COPYING
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"""Check Python 2 code for Python 2/3 source-compatible issues."""
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from __future__ import absolute_import, print_function
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import re
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import sys
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import tokenize
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from collections import namedtuple
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import six
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import astroid
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from astroid import bases
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from pylint import checkers, interfaces
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from pylint.interfaces import INFERENCE_FAILURE, INFERENCE
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from pylint.utils import WarningScope
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from pylint.checkers import utils
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_ZERO = re.compile("^0+$")
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def _is_old_octal(literal):
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if _ZERO.match(literal):
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return False
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if re.match(r'0\d+', literal):
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try:
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int(literal, 8)
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except ValueError:
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return False
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return True
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def _check_dict_node(node):
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inferred_types = set()
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try:
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inferred = node.infer()
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for inferred_node in inferred:
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inferred_types.add(inferred_node)
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except astroid.InferenceError:
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pass
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return (not inferred_types
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or any(isinstance(x, astroid.Dict) for x in inferred_types))
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def _is_builtin(node):
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return getattr(node, 'name', None) in ('__builtin__', 'builtins')
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_ACCEPTS_ITERATOR = {'iter', 'list', 'tuple', 'sorted', 'set', 'sum', 'any',
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'all', 'enumerate', 'dict'}
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def _in_iterating_context(node):
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"""Check if the node is being used as an iterator.
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Definition is taken from lib2to3.fixer_util.in_special_context().
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"""
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parent = node.parent
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# Since a call can't be the loop variant we only need to know if the node's
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# parent is a 'for' loop to know it's being used as the iterator for the
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# loop.
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if isinstance(parent, astroid.For):
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return True
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# Need to make sure the use of the node is in the iterator part of the
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# comprehension.
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elif isinstance(parent, astroid.Comprehension):
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if parent.iter == node:
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return True
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# Various built-ins can take in an iterable or list and lead to the same
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# value.
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elif isinstance(parent, astroid.Call):
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if isinstance(parent.func, astroid.Name):
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parent_scope = parent.func.lookup(parent.func.name)[0]
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if _is_builtin(parent_scope) and parent.func.name in _ACCEPTS_ITERATOR:
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return True
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elif isinstance(parent.func, astroid.Attribute):
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if parent.func.attrname == 'join':
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return True
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# If the call is in an unpacking, there's no need to warn,
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# since it can be considered iterating.
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elif (isinstance(parent, astroid.Assign) and
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isinstance(parent.targets[0], (astroid.List, astroid.Tuple))):
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if len(parent.targets[0].elts) > 1:
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return True
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return False
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def _is_conditional_import(node):
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"""Checks if a import node is in the context of a conditional.
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"""
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parent = node.parent
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return isinstance(parent, (astroid.TryExcept, astroid.ExceptHandler,
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astroid.If, astroid.IfExp))
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Branch = namedtuple('Branch', ['node', 'is_py2_only'])
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class Python3Checker(checkers.BaseChecker):
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__implements__ = interfaces.IAstroidChecker
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enabled = False
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name = 'python3'
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msgs = {
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# Errors for what will syntactically break in Python 3, warnings for
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# everything else.
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'E1601': ('print statement used',
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'print-statement',
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'Used when a print statement is used '
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'(`print` is a function in Python 3)',
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{'maxversion': (3, 0)}),
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'E1602': ('Parameter unpacking specified',
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'parameter-unpacking',
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'Used when parameter unpacking is specified for a function'
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"(Python 3 doesn't allow it)",
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{'maxversion': (3, 0)}),
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'E1603': ('Implicit unpacking of exceptions is not supported '
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'in Python 3',
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'unpacking-in-except',
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'Python3 will not allow implicit unpacking of '
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'exceptions in except clauses. '
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'See http://www.python.org/dev/peps/pep-3110/',
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{'maxversion': (3, 0),
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'old_names': [('W0712', 'unpacking-in-except')]}),
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'E1604': ('Use raise ErrorClass(args) instead of '
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'raise ErrorClass, args.',
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'old-raise-syntax',
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"Used when the alternate raise syntax "
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"'raise foo, bar' is used "
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"instead of 'raise foo(bar)'.",
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{'maxversion': (3, 0),
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'old_names': [('W0121', 'old-raise-syntax')]}),
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'E1605': ('Use of the `` operator',
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'backtick',
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'Used when the deprecated "``" (backtick) operator is used '
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'instead of the str() function.',
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{'scope': WarningScope.NODE,
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'maxversion': (3, 0),
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'old_names': [('W0333', 'backtick')]}),
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'E1609': ('Import * only allowed at module level',
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'import-star-module-level',
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'Used when the import star syntax is used somewhere '
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'else than the module level.',
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{'maxversion': (3, 0)}),
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'W1601': ('apply built-in referenced',
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'apply-builtin',
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'Used when the apply built-in function is referenced '
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'(missing from Python 3)',
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{'maxversion': (3, 0)}),
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'W1602': ('basestring built-in referenced',
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'basestring-builtin',
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'Used when the basestring built-in function is referenced '
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'(missing from Python 3)',
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{'maxversion': (3, 0)}),
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'W1603': ('buffer built-in referenced',
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'buffer-builtin',
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'Used when the buffer built-in function is referenced '
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'(missing from Python 3)',
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{'maxversion': (3, 0)}),
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'W1604': ('cmp built-in referenced',
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'cmp-builtin',
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'Used when the cmp built-in function is referenced '
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'(missing from Python 3)',
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{'maxversion': (3, 0)}),
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'W1605': ('coerce built-in referenced',
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'coerce-builtin',
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'Used when the coerce built-in function is referenced '
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'(missing from Python 3)',
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{'maxversion': (3, 0)}),
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'W1606': ('execfile built-in referenced',
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'execfile-builtin',
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'Used when the execfile built-in function is referenced '
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'(missing from Python 3)',
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{'maxversion': (3, 0)}),
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'W1607': ('file built-in referenced',
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'file-builtin',
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'Used when the file built-in function is referenced '
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'(missing from Python 3)',
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{'maxversion': (3, 0)}),
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'W1608': ('long built-in referenced',
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'long-builtin',
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'Used when the long built-in function is referenced '
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'(missing from Python 3)',
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{'maxversion': (3, 0)}),
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'W1609': ('raw_input built-in referenced',
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'raw_input-builtin',
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'Used when the raw_input built-in function is referenced '
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'(missing from Python 3)',
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{'maxversion': (3, 0)}),
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'W1610': ('reduce built-in referenced',
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'reduce-builtin',
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'Used when the reduce built-in function is referenced '
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'(missing from Python 3)',
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{'maxversion': (3, 0)}),
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'W1611': ('StandardError built-in referenced',
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'standarderror-builtin',
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'Used when the StandardError built-in function is referenced '
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'(missing from Python 3)',
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{'maxversion': (3, 0)}),
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'W1612': ('unicode built-in referenced',
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'unicode-builtin',
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'Used when the unicode built-in function is referenced '
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'(missing from Python 3)',
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{'maxversion': (3, 0)}),
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'W1613': ('xrange built-in referenced',
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'xrange-builtin',
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'Used when the xrange built-in function is referenced '
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'(missing from Python 3)',
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{'maxversion': (3, 0)}),
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'W1614': ('__coerce__ method defined',
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'coerce-method',
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'Used when a __coerce__ method is defined '
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'(method is not used by Python 3)',
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{'maxversion': (3, 0)}),
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'W1615': ('__delslice__ method defined',
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'delslice-method',
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'Used when a __delslice__ method is defined '
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'(method is not used by Python 3)',
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{'maxversion': (3, 0)}),
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'W1616': ('__getslice__ method defined',
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'getslice-method',
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'Used when a __getslice__ method is defined '
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'(method is not used by Python 3)',
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{'maxversion': (3, 0)}),
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'W1617': ('__setslice__ method defined',
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'setslice-method',
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'Used when a __setslice__ method is defined '
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'(method is not used by Python 3)',
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{'maxversion': (3, 0)}),
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'W1618': ('import missing `from __future__ import absolute_import`',
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'no-absolute-import',
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'Used when an import is not accompanied by '
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'``from __future__ import absolute_import`` '
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'(default behaviour in Python 3)',
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{'maxversion': (3, 0)}),
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'W1619': ('division w/o __future__ statement',
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'old-division',
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'Used for non-floor division w/o a float literal or '
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'``from __future__ import division`` '
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'(Python 3 returns a float for int division unconditionally)',
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{'maxversion': (3, 0)}),
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'W1620': ('Calling a dict.iter*() method',
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'dict-iter-method',
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'Used for calls to dict.iterkeys(), itervalues() or iteritems() '
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'(Python 3 lacks these methods)',
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{'maxversion': (3, 0)}),
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'W1621': ('Calling a dict.view*() method',
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'dict-view-method',
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'Used for calls to dict.viewkeys(), viewvalues() or viewitems() '
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'(Python 3 lacks these methods)',
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{'maxversion': (3, 0)}),
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'W1622': ('Called a next() method on an object',
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'next-method-called',
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"Used when an object's next() method is called "
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'(Python 3 uses the next() built-in function)',
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{'maxversion': (3, 0)}),
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'W1623': ("Assigning to a class's __metaclass__ attribute",
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'metaclass-assignment',
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"Used when a metaclass is specified by assigning to __metaclass__ "
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'(Python 3 specifies the metaclass as a class statement argument)',
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{'maxversion': (3, 0)}),
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'W1624': ('Indexing exceptions will not work on Python 3',
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'indexing-exception',
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'Indexing exceptions will not work on Python 3. Use '
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'`exception.args[index]` instead.',
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{'maxversion': (3, 0),
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'old_names': [('W0713', 'indexing-exception')]}),
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'W1625': ('Raising a string exception',
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'raising-string',
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'Used when a string exception is raised. This will not '
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'work on Python 3.',
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{'maxversion': (3, 0),
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'old_names': [('W0701', 'raising-string')]}),
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'W1626': ('reload built-in referenced',
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'reload-builtin',
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'Used when the reload built-in function is referenced '
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'(missing from Python 3). You can use instead imp.reload '
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'or importlib.reload.',
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{'maxversion': (3, 0)}),
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'W1627': ('__oct__ method defined',
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'oct-method',
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'Used when a __oct__ method is defined '
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'(method is not used by Python 3)',
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{'maxversion': (3, 0)}),
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'W1628': ('__hex__ method defined',
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'hex-method',
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'Used when a __hex__ method is defined '
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'(method is not used by Python 3)',
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{'maxversion': (3, 0)}),
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'W1629': ('__nonzero__ method defined',
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'nonzero-method',
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'Used when a __nonzero__ method is defined '
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'(method is not used by Python 3)',
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{'maxversion': (3, 0)}),
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'W1630': ('__cmp__ method defined',
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'cmp-method',
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'Used when a __cmp__ method is defined '
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'(method is not used by Python 3)',
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{'maxversion': (3, 0)}),
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# 'W1631': replaced by W1636
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'W1632': ('input built-in referenced',
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'input-builtin',
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'Used when the input built-in is referenced '
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'(backwards-incompatible semantics in Python 3)',
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{'maxversion': (3, 0)}),
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'W1633': ('round built-in referenced',
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'round-builtin',
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'Used when the round built-in is referenced '
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'(backwards-incompatible semantics in Python 3)',
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{'maxversion': (3, 0)}),
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'W1634': ('intern built-in referenced',
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'intern-builtin',
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'Used when the intern built-in is referenced '
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'(Moved to sys.intern in Python 3)',
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{'maxversion': (3, 0)}),
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'W1635': ('unichr built-in referenced',
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'unichr-builtin',
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'Used when the unichr built-in is referenced '
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'(Use chr in Python 3)',
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{'maxversion': (3, 0)}),
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'W1636': ('map built-in referenced when not iterating',
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'map-builtin-not-iterating',
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'Used when the map built-in is referenced in a non-iterating '
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'context (returns an iterator in Python 3)',
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{'maxversion': (3, 0),
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'old_names': [('W1631', 'implicit-map-evaluation')]}),
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'W1637': ('zip built-in referenced when not iterating',
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'zip-builtin-not-iterating',
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'Used when the zip built-in is referenced in a non-iterating '
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'context (returns an iterator in Python 3)',
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{'maxversion': (3, 0)}),
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'W1638': ('range built-in referenced when not iterating',
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'range-builtin-not-iterating',
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'Used when the range built-in is referenced in a non-iterating '
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'context (returns an iterator in Python 3)',
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{'maxversion': (3, 0)}),
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'W1639': ('filter built-in referenced when not iterating',
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'filter-builtin-not-iterating',
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'Used when the filter built-in is referenced in a non-iterating '
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'context (returns an iterator in Python 3)',
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{'maxversion': (3, 0)}),
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'W1640': ('Using the cmp argument for list.sort / sorted',
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'using-cmp-argument',
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'Using the cmp argument for list.sort or the sorted '
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'builtin should be avoided, since it was removed in '
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'Python 3. Using either `key` or `functools.cmp_to_key` '
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'should be preferred.',
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{'maxversion': (3, 0)}),
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'W1641': ('Implementing __eq__ without also implementing __hash__',
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'eq-without-hash',
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'Used when a class implements __eq__ but not __hash__. In Python 2, objects '
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'get object.__hash__ as the default implementation, in Python 3 objects get '
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'None as their default __hash__ implementation if they also implement __eq__.',
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{'maxversion': (3, 0)}),
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'W1642': ('__div__ method defined',
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'div-method',
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'Used when a __div__ method is defined. Using `__truediv__` and setting'
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'__div__ = __truediv__ should be preferred.'
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'(method is not used by Python 3)',
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{'maxversion': (3, 0)}),
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'W1643': ('__idiv__ method defined',
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'idiv-method',
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'Used when a __idiv__ method is defined. Using `__itruediv__` and setting'
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'__idiv__ = __itruediv__ should be preferred.'
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'(method is not used by Python 3)',
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{'maxversion': (3, 0)}),
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'W1644': ('__rdiv__ method defined',
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'rdiv-method',
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'Used when a __rdiv__ method is defined. Using `__rtruediv__` and setting'
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'__rdiv__ = __rtruediv__ should be preferred.'
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'(method is not used by Python 3)',
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{'maxversion': (3, 0)}),
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'W1645': ('Exception.message removed in Python 3',
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'exception-message-attribute',
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'Used when the message attribute is accessed on an Exception. Use '
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'str(exception) instead.',
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{'maxversion': (3, 0)}),
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'W1646': ('non-text encoding used in str.decode',
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'invalid-str-codec',
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'Used when using str.encode or str.decode with a non-text encoding. Use '
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'codecs module to handle arbitrary codecs.',
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{'maxversion': (3, 0)}),
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'W1647': ('sys.maxint removed in Python 3',
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'sys-max-int',
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'Used when accessing sys.maxint. Use sys.maxsize instead.',
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{'maxversion': (3, 0)}),
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'W1648': ('Module moved in Python 3',
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'bad-python3-import',
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'Used when importing a module that no longer exists in Python 3.',
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{'maxversion': (3, 0)}),
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'W1649': ('Accessing a function method on the string module',
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'deprecated-string-function',
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'Used when accessing a string function that has been deprecated in Python 3.',
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{'maxversion': (3, 0)}),
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'W1650': ('Using str.translate with deprecated deletechars parameters',
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'deprecated-str-translate-call',
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'Used when using the deprecated deletechars parameters from str.translate. Use'
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're.sub to remove the desired characters ',
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{'maxversion': (3, 0)}),
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}
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_bad_builtins = frozenset([
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'apply',
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'basestring',
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'buffer',
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'cmp',
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'coerce',
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'execfile',
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'file',
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'input', # Not missing, but incompatible semantics
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'intern',
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'long',
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'raw_input',
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'reduce',
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'round', # Not missing, but incompatible semantics
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'StandardError',
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'unichr',
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'unicode',
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'xrange',
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'reload',
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])
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_unused_magic_methods = frozenset([
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'__coerce__',
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'__delslice__',
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'__getslice__',
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'__setslice__',
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'__oct__',
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'__hex__',
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'__nonzero__',
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'__cmp__',
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'__div__',
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'__idiv__',
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'__rdiv__',
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])
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_invalid_encodings = frozenset([
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'base64_codec',
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'base64',
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'base_64',
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'bz2_codec',
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'bz2',
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'hex_codec',
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'hex',
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'quopri_codec',
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'quopri',
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'quotedprintable',
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'quoted_printable',
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'uu_codec',
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'uu',
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'zlib_codec',
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'zlib',
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'zip',
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'rot13',
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'rot_13',
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])
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_bad_python3_module_map = {
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'sys-max-int': {
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'sys': frozenset(['maxint'])
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},
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'bad-python3-import': frozenset([
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'anydbm', 'BaseHTTPServer', '__builtin__', 'CGIHTTPServer', 'ConfigParser', 'copy_reg',
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'cPickle', 'cProfile', 'cStringIO', 'Cookie', 'cookielib', 'dbhash', 'dbm', 'dumbdbm',
|
|
'dumbdb', 'Dialog', 'DocXMLRPCServer', 'FileDialog', 'FixTk', 'gdbm', 'htmlentitydefs',
|
|
'HTMLParser', 'httplib', 'markupbase', 'Queue', 'repr', 'robotparser', 'ScrolledText',
|
|
'SimpleDialog', 'SimpleHTTPServer', 'SimpleXMLRPCServer', 'StringIO', 'dummy_thread',
|
|
'SocketServer', 'test.test_support', 'Tkinter', 'Tix', 'Tkconstants', 'tkColorChooser',
|
|
'tkCommonDialog', 'Tkdnd', 'tkFileDialog', 'tkFont', 'tkMessageBox', 'tkSimpleDialog',
|
|
'turtle', 'UserList', 'UserString', 'whichdb', '_winreg', 'xmlrpclib', 'audiodev',
|
|
'Bastion', 'bsddb185', 'bsddb3', 'Canvas', 'cfmfile', 'cl', 'commands', 'compiler',
|
|
'dircache', 'dl', 'exception', 'fpformat', 'htmllib', 'ihooks', 'imageop', 'imputil',
|
|
'linuxaudiodev', 'md5', 'mhlib', 'mimetools', 'MimeWriter', 'mimify', 'multifile',
|
|
'mutex', 'new', 'popen2', 'posixfile', 'pure', 'rexec', 'rfc822', 'sha', 'sgmllib',
|
|
'sre', 'stat', 'stringold', 'sunaudio', 'sv', 'test.testall', 'thread', 'timing',
|
|
'toaiff', 'user', 'urllib2', 'urlparse'
|
|
]),
|
|
'deprecated-string-function': {
|
|
'string': frozenset([
|
|
'maketrans', 'atof', 'atoi', 'atol', 'capitalize', 'expandtabs', 'find', 'rfind',
|
|
'index', 'rindex', 'count', 'lower', 'split', 'rsplit', 'splitfields', 'join',
|
|
'joinfields', 'lstrip', 'rstrip', 'strip', 'swapcase', 'translate', 'upper',
|
|
'ljust', 'rjust', 'center', 'zfill', 'replace'
|
|
])
|
|
}
|
|
}
|
|
|
|
if (3, 4) <= sys.version_info < (3, 4, 4):
|
|
# Python 3.4.0 -> 3.4.3 has a bug which breaks `repr_tree()`:
|
|
# https://bugs.python.org/issue23572
|
|
_python_2_tests = frozenset()
|
|
else:
|
|
_python_2_tests = frozenset(
|
|
[astroid.extract_node(x).repr_tree() for x in [
|
|
'sys.version_info[0] == 2',
|
|
'sys.version_info[0] < 3',
|
|
'sys.version_info == (2, 7)',
|
|
'sys.version_info <= (2, 7)',
|
|
'sys.version_info < (3, 0)',
|
|
]])
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
self._future_division = False
|
|
self._future_absolute_import = False
|
|
self._modules_warned_about = set()
|
|
self._branch_stack = []
|
|
super(Python3Checker, self).__init__(*args, **kwargs)
|
|
|
|
def add_message(self, msg_id, always_warn=False, # pylint: disable=arguments-differ
|
|
*args, **kwargs):
|
|
if always_warn or not (self._branch_stack and self._branch_stack[-1].is_py2_only):
|
|
super(Python3Checker, self).add_message(msg_id, *args, **kwargs)
|
|
|
|
def _is_py2_test(self, node):
|
|
if isinstance(node.test, astroid.Attribute) and isinstance(node.test.expr, astroid.Name):
|
|
if node.test.expr.name == 'six' and node.test.attrname == 'PY2':
|
|
return True
|
|
elif (isinstance(node.test, astroid.Compare) and
|
|
node.test.repr_tree() in self._python_2_tests):
|
|
return True
|
|
return False
|
|
|
|
def visit_if(self, node):
|
|
self._branch_stack.append(Branch(node, self._is_py2_test(node)))
|
|
|
|
def leave_if(self, node):
|
|
assert self._branch_stack.pop().node == node
|
|
|
|
def visit_ifexp(self, node):
|
|
self._branch_stack.append(Branch(node, self._is_py2_test(node)))
|
|
|
|
def leave_ifexp(self, node):
|
|
assert self._branch_stack.pop().node == node
|
|
|
|
def visit_module(self, node): # pylint: disable=unused-argument
|
|
"""Clear checker state after previous module."""
|
|
self._future_division = False
|
|
self._future_absolute_import = False
|
|
|
|
def visit_functiondef(self, node):
|
|
if node.is_method() and node.name in self._unused_magic_methods:
|
|
method_name = node.name
|
|
if node.name.startswith('__'):
|
|
method_name = node.name[2:-2]
|
|
self.add_message(method_name + '-method', node=node)
|
|
|
|
@utils.check_messages('parameter-unpacking')
|
|
def visit_arguments(self, node):
|
|
for arg in node.args:
|
|
if isinstance(arg, astroid.Tuple):
|
|
self.add_message('parameter-unpacking', node=arg)
|
|
|
|
def visit_name(self, node):
|
|
"""Detect when a "bad" built-in is referenced."""
|
|
found_node = node.lookup(node.name)[0]
|
|
if _is_builtin(found_node):
|
|
if node.name in self._bad_builtins:
|
|
message = node.name.lower() + '-builtin'
|
|
self.add_message(message, node=node)
|
|
|
|
@utils.check_messages('print-statement')
|
|
def visit_print(self, node):
|
|
self.add_message('print-statement', node=node, always_warn=True)
|
|
|
|
def _warn_if_deprecated(self, node, module, attributes, report_on_modules=True):
|
|
for message, module_map in six.iteritems(self._bad_python3_module_map):
|
|
if module in module_map and module not in self._modules_warned_about:
|
|
if isinstance(module_map, frozenset):
|
|
if report_on_modules:
|
|
self._modules_warned_about.add(module)
|
|
self.add_message(message, node=node)
|
|
elif attributes and module_map[module].intersection(attributes):
|
|
self.add_message(message, node=node)
|
|
|
|
def visit_importfrom(self, node):
|
|
if node.modname == '__future__':
|
|
for name, _ in node.names:
|
|
if name == 'division':
|
|
self._future_division = True
|
|
elif name == 'absolute_import':
|
|
self._future_absolute_import = True
|
|
else:
|
|
if not self._future_absolute_import:
|
|
if self.linter.is_message_enabled('no-absolute-import'):
|
|
self.add_message('no-absolute-import', node=node)
|
|
if not _is_conditional_import(node):
|
|
self._warn_if_deprecated(node, node.modname, {x[0] for x in node.names})
|
|
|
|
if node.names[0][0] == '*':
|
|
if self.linter.is_message_enabled('import-star-module-level'):
|
|
if not isinstance(node.scope(), astroid.Module):
|
|
self.add_message('import-star-module-level', node=node)
|
|
|
|
def visit_import(self, node):
|
|
if not self._future_absolute_import:
|
|
self.add_message('no-absolute-import', node=node)
|
|
if not _is_conditional_import(node):
|
|
for name, _ in node.names:
|
|
self._warn_if_deprecated(node, name, None)
|
|
|
|
@utils.check_messages('metaclass-assignment')
|
|
def visit_classdef(self, node):
|
|
if '__metaclass__' in node.locals:
|
|
self.add_message('metaclass-assignment', node=node)
|
|
locals_and_methods = set(node.locals).union(x.name for x in node.mymethods())
|
|
if '__eq__' in locals_and_methods and '__hash__' not in locals_and_methods:
|
|
self.add_message('eq-without-hash', node=node)
|
|
|
|
@utils.check_messages('old-division')
|
|
def visit_binop(self, node):
|
|
if not self._future_division and node.op == '/':
|
|
for arg in (node.left, node.right):
|
|
if isinstance(arg, astroid.Const) and isinstance(arg.value, float):
|
|
break
|
|
else:
|
|
self.add_message('old-division', node=node)
|
|
|
|
def _check_cmp_argument(self, node):
|
|
# Check that the `cmp` argument is used
|
|
kwargs = []
|
|
if (isinstance(node.func, astroid.Attribute)
|
|
and node.func.attrname == 'sort'):
|
|
inferred = utils.safe_infer(node.func.expr)
|
|
if not inferred:
|
|
return
|
|
|
|
builtins_list = "{}.list".format(bases.BUILTINS)
|
|
if (isinstance(inferred, astroid.List)
|
|
or inferred.qname() == builtins_list):
|
|
kwargs = node.keywords
|
|
|
|
elif (isinstance(node.func, astroid.Name)
|
|
and node.func.name == 'sorted'):
|
|
inferred = utils.safe_infer(node.func)
|
|
if not inferred:
|
|
return
|
|
|
|
builtins_sorted = "{}.sorted".format(bases.BUILTINS)
|
|
if inferred.qname() == builtins_sorted:
|
|
kwargs = node.keywords
|
|
|
|
for kwarg in kwargs or []:
|
|
if kwarg.arg == 'cmp':
|
|
self.add_message('using-cmp-argument', node=node)
|
|
return
|
|
|
|
@staticmethod
|
|
def _is_constant_string_or_name(node):
|
|
if isinstance(node, astroid.Const):
|
|
return isinstance(node.value, six.string_types)
|
|
return isinstance(node, astroid.Name)
|
|
|
|
@staticmethod
|
|
def _is_none(node):
|
|
return isinstance(node, astroid.Const) and node.value is None
|
|
|
|
@staticmethod
|
|
def _has_only_n_positional_args(node, number_of_args):
|
|
return len(node.args) == number_of_args and all(node.args) and not node.keywords
|
|
|
|
@staticmethod
|
|
def _could_be_string(inferred_types):
|
|
confidence = INFERENCE if inferred_types else INFERENCE_FAILURE
|
|
for inferred_type in inferred_types:
|
|
if inferred_type is astroid.Uninferable:
|
|
confidence = INFERENCE_FAILURE
|
|
elif not (isinstance(inferred_type, astroid.Const) and
|
|
isinstance(inferred_type.value, six.string_types)):
|
|
return None
|
|
return confidence
|
|
|
|
def visit_call(self, node):
|
|
self._check_cmp_argument(node)
|
|
|
|
if isinstance(node.func, astroid.Attribute):
|
|
inferred_types = set()
|
|
try:
|
|
for inferred_receiver in node.func.expr.infer():
|
|
inferred_types.add(inferred_receiver)
|
|
if isinstance(inferred_receiver, astroid.Module):
|
|
self._warn_if_deprecated(node, inferred_receiver.name,
|
|
{node.func.attrname},
|
|
report_on_modules=False)
|
|
except astroid.InferenceError:
|
|
pass
|
|
if node.args:
|
|
is_str_confidence = self._could_be_string(inferred_types)
|
|
if is_str_confidence:
|
|
if (node.func.attrname in ('encode', 'decode') and
|
|
len(node.args) >= 1 and node.args[0]):
|
|
first_arg = node.args[0]
|
|
self._validate_encoding(first_arg, node)
|
|
if (node.func.attrname == 'translate' and
|
|
self._has_only_n_positional_args(node, 2) and
|
|
self._is_none(node.args[0]) and
|
|
self._is_constant_string_or_name(node.args[1])):
|
|
# The above statement looking for calls of the form:
|
|
#
|
|
# foo.translate(None, 'abc123')
|
|
#
|
|
# or
|
|
#
|
|
# foo.translate(None, some_variable)
|
|
#
|
|
# This check is somewhat broad and _may_ have some false positives, but
|
|
# after checking several large codebases it did not have any false
|
|
# positives while finding several real issues. This call pattern seems
|
|
# rare enough that the trade off is worth it.
|
|
self.add_message('deprecated-str-translate-call',
|
|
node=node,
|
|
confidence=is_str_confidence)
|
|
return
|
|
if node.keywords:
|
|
return
|
|
if node.func.attrname == 'next':
|
|
self.add_message('next-method-called', node=node)
|
|
else:
|
|
if _check_dict_node(node.func.expr):
|
|
if node.func.attrname in ('iterkeys', 'itervalues', 'iteritems'):
|
|
self.add_message('dict-iter-method', node=node)
|
|
elif node.func.attrname in ('viewkeys', 'viewvalues', 'viewitems'):
|
|
self.add_message('dict-view-method', node=node)
|
|
elif isinstance(node.func, astroid.Name):
|
|
found_node = node.func.lookup(node.func.name)[0]
|
|
if _is_builtin(found_node):
|
|
if node.func.name in ('filter', 'map', 'range', 'zip'):
|
|
if not _in_iterating_context(node):
|
|
checker = '{}-builtin-not-iterating'.format(node.func.name)
|
|
self.add_message(checker, node=node)
|
|
if node.func.name == 'open' and node.keywords:
|
|
kwargs = node.keywords
|
|
for kwarg in kwargs or []:
|
|
if kwarg.arg == 'encoding':
|
|
self._validate_encoding(kwarg.value, node)
|
|
break
|
|
|
|
def _validate_encoding(self, encoding, node):
|
|
if isinstance(encoding, astroid.Const):
|
|
value = encoding.value
|
|
if value in self._invalid_encodings:
|
|
self.add_message('invalid-str-codec',
|
|
node=node)
|
|
|
|
@utils.check_messages('indexing-exception')
|
|
def visit_subscript(self, node):
|
|
""" Look for indexing exceptions. """
|
|
try:
|
|
for inferred in node.value.infer():
|
|
if not isinstance(inferred, astroid.Instance):
|
|
continue
|
|
if utils.inherit_from_std_ex(inferred):
|
|
self.add_message('indexing-exception', node=node)
|
|
except astroid.InferenceError:
|
|
return
|
|
|
|
def visit_assignattr(self, node):
|
|
if isinstance(node.assign_type(), astroid.AugAssign):
|
|
self.visit_attribute(node)
|
|
|
|
def visit_delattr(self, node):
|
|
self.visit_attribute(node)
|
|
|
|
@utils.check_messages('exception-message-attribute')
|
|
def visit_attribute(self, node):
|
|
""" Look for accessing message on exceptions. """
|
|
try:
|
|
for inferred in node.expr.infer():
|
|
if (isinstance(inferred, astroid.Instance) and
|
|
utils.inherit_from_std_ex(inferred)):
|
|
if node.attrname == 'message':
|
|
self.add_message('exception-message-attribute', node=node)
|
|
if isinstance(inferred, astroid.Module):
|
|
self._warn_if_deprecated(node, inferred.name, {node.attrname},
|
|
report_on_modules=False)
|
|
except astroid.InferenceError:
|
|
return
|
|
|
|
@utils.check_messages('unpacking-in-except')
|
|
def visit_excepthandler(self, node):
|
|
"""Visit an except handler block and check for exception unpacking."""
|
|
if isinstance(node.name, (astroid.Tuple, astroid.List)):
|
|
self.add_message('unpacking-in-except', node=node)
|
|
|
|
@utils.check_messages('backtick')
|
|
def visit_repr(self, node):
|
|
self.add_message('backtick', node=node)
|
|
|
|
@utils.check_messages('raising-string', 'old-raise-syntax')
|
|
def visit_raise(self, node):
|
|
"""Visit a raise statement and check for raising
|
|
strings or old-raise-syntax.
|
|
"""
|
|
if (node.exc is not None and
|
|
node.inst is not None and
|
|
node.tback is None):
|
|
self.add_message('old-raise-syntax', node=node)
|
|
|
|
# Ignore empty raise.
|
|
if node.exc is None:
|
|
return
|
|
expr = node.exc
|
|
if self._check_raise_value(node, expr):
|
|
return
|
|
else:
|
|
try:
|
|
value = next(astroid.unpack_infer(expr))
|
|
except astroid.InferenceError:
|
|
return
|
|
self._check_raise_value(node, value)
|
|
|
|
def _check_raise_value(self, node, expr):
|
|
if isinstance(expr, astroid.Const):
|
|
value = expr.value
|
|
if isinstance(value, str):
|
|
self.add_message('raising-string', node=node)
|
|
return True
|
|
|
|
|
|
class Python3TokenChecker(checkers.BaseTokenChecker):
|
|
__implements__ = interfaces.ITokenChecker
|
|
name = 'python3'
|
|
enabled = False
|
|
|
|
msgs = {
|
|
'E1606': ('Use of long suffix',
|
|
'long-suffix',
|
|
'Used when "l" or "L" is used to mark a long integer. '
|
|
'This will not work in Python 3, since `int` and `long` '
|
|
'types have merged.',
|
|
{'maxversion': (3, 0)}),
|
|
'E1607': ('Use of the <> operator',
|
|
'old-ne-operator',
|
|
'Used when the deprecated "<>" operator is used instead '
|
|
'of "!=". This is removed in Python 3.',
|
|
{'maxversion': (3, 0),
|
|
'old_names': [('W0331', 'old-ne-operator')]}),
|
|
'E1608': ('Use of old octal literal',
|
|
'old-octal-literal',
|
|
'Used when encountering the old octal syntax, '
|
|
'removed in Python 3. To use the new syntax, '
|
|
'prepend 0o on the number.',
|
|
{'maxversion': (3, 0)}),
|
|
}
|
|
|
|
def process_tokens(self, tokens):
|
|
for idx, (tok_type, token, start, _, _) in enumerate(tokens):
|
|
if tok_type == tokenize.NUMBER:
|
|
if token.lower().endswith('l'):
|
|
# This has a different semantic than lowercase-l-suffix.
|
|
self.add_message('long-suffix', line=start[0])
|
|
elif _is_old_octal(token):
|
|
self.add_message('old-octal-literal', line=start[0])
|
|
if tokens[idx][1] == '<>':
|
|
self.add_message('old-ne-operator', line=tokens[idx][2][0])
|
|
|
|
|
|
def register(linter):
|
|
linter.register_checker(Python3Checker(linter))
|
|
linter.register_checker(Python3TokenChecker(linter))
|