AttributeError: 'NoneType' object has no attribute 'frame'

[MarKett]

Steps to reproduce

1. Create reproduce.py with:

class MyClass():
    def fu(self, objects):
        delitem = dict.__delitem__.__get__(self, dict)
        for k in objects:
            delitem(k)

2. Run pylint 2.5.3 on the file.

Current behavior

Exception:

  File "D:\Program Files\Python38\lib\site-packages\pylint\lint\run.py", line 344, in __init__
    linter.check(args)
  File "D:\Program Files\Python38\lib\site-packages\pylint\lint\pylinter.py", line 870, in check
    self._check_files(
  File "D:\Program Files\Python38\lib\site-packages\pylint\lint\pylinter.py", line 904, in _check_files
    self._check_file(get_ast, check_astroid_module, name, filepath, modname)
  File "D:\Program Files\Python38\lib\site-packages\pylint\lint\pylinter.py", line 930, in _check_file
    check_astroid_module(ast_node)
  File "D:\Program Files\Python38\lib\site-packages\pylint\lint\pylinter.py", line 1062, in check_astroid_module
    retval = self._check_astroid_module(
  File "D:\Program Files\Python38\lib\site-packages\pylint\lint\pylinter.py", line 1107, in _check_astroid_module
    walker.walk(ast_node)
  File "D:\Program Files\Python38\lib\site-packages\pylint\utils\ast_walker.py", line 75, in walk
    self.walk(child)
  File "D:\Program Files\Python38\lib\site-packages\pylint\utils\ast_walker.py", line 75, in walk
    self.walk(child)
  File "D:\Program Files\Python38\lib\site-packages\pylint\utils\ast_walker.py", line 75, in walk
    self.walk(child)
  [Previous line repeated 2 more times]
  File "D:\Program Files\Python38\lib\site-packages\pylint\utils\ast_walker.py", line 72, in walk
    callback(astroid)
  File "D:\Program Files\Python38\lib\site-packages\pylint\checkers\refactoring.py", line 720, in visit_call
    self._check_raising_stopiteration_in_generator_next_call(node)
  File "D:\Program Files\Python38\lib\site-packages\pylint\checkers\refactoring.py", line 761, in _check_raising_stopiteration_in_generator_next_call
    inferred = utils.safe_infer(node.func)
  File "D:\Program Files\Python38\lib\site-packages\pylint\checkers\utils.py", line 1124, in safe_infer
    inferred_types.add(_get_python_type_of_node(value))
  File "D:\Program Files\Python38\lib\site-packages\pylint\checkers\utils.py", line 1103, in _get_python_type_of_node
    return pytype()
  File "D:\Program Files\Python38\lib\site-packages\astroid\scoped_nodes.py", line 1185, in pytype
    if "method" in self.type:
  File "D:\Program Files\Python38\lib\site-packages\astroid\decorators.py", line 72, in __get__
    val = self.wrapped(inst)
  File "D:\Program Files\Python38\lib\site-packages\astroid\scoped_nodes.py", line 1461, in type
    for decorator in self.extra_decorators:
  File "D:\Program Files\Python38\lib\site-packages\astroid\decorators.py", line 72, in __get__
    val = self.wrapped(inst)
  File "D:\Program Files\Python38\lib\site-packages\astroid\scoped_nodes.py", line 1419, in extra_decorators
    frame = self.parent.frame()
AttributeError: 'NoneType' object has no attribute 'frame'

Expected behavior

Normal pylint run without exception.

python -c "from astroid import __pkginfo__; print(__pkginfo__.version)" output

Python 3.8.3
Pylint 2.5.3
astroid 2.4.1

[PCManticore]

Thanks for the report, I can reproduce the issue.