Noissue - Improved accuracy of evaluated expressions for A103 and A207

flake8-eyeo/flake8_eyeo.py

 # This file is part of Adblock Plus <https://adblockplus.org/>,
 # Copyright (C) 2006-present eyeo GmbH
 #
 # Adblock Plus is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 3 as
 # published by the Free Software Foundation.
 #
 # Adblock Plus is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
@@ skipping 28 matching lines @@
 }
 
 ESSENTIAL_BUILTINS = set(dir(builtins)) - {'apply', 'buffer', 'coerce',
                                            'intern', 'file'}
 
 LEAVE_BLOCK = (ast.Return, ast.Raise, ast.Continue, ast.Break)
 VOLATILE = object()
 
 
 def evaluate(node):
+    names = {'__builtins__': {'True': True, 'False': False, 'None': None}}
     try:
-        return eval(compile(ast.Expression(node), '', 'eval'), {})
+        return eval(compile(ast.Expression(node), '', 'eval'), names)
     except Exception:
         return VOLATILE
 
 
 def is_const(node):
     return evaluate(node) is not VOLATILE
 
 
 def get_identifier(node):
     if isinstance(node, ast.Name):
@@ skipping 403 matching lines @@
                     return [(pos, 'A111 redundant parenthesis for {} '
                                   'statement'.format(statement))]
 
     return []
 
 
 for checker in [check_ast, check_non_default_encoding,
                 check_quotes, check_redundant_parenthesis]:
     checker.name = 'eyeo'
     checker.version = __version__