AttributeError: 'ClassDef' object has no attribute 'value'

[dickreuter]

Running the latest version of pylint (2.6, and also with 2.4.4), I get this error:

astroid/bases.py:113: AttributeError: 'ClassDef' object has no attribute 'value'

Any suggestions on what could be causing it would be greatly appreciated.

[hippo91]

@dickreuter thanks for your report. Could you please follow the issue template submission so that we have at least a small piece of code to start with?

[dickreuter]

The issue only occurred when the folder with the venv was included in the scanned files.

[jacobtylerwalls]

The issue only occurred when the folder with the venv was included in the scanned files.

I reproduced a similar failure in this scenario, linting a file from cryptography (part of the venv's packages). I reduced the example to this. Failure looks to be in pylint's _supports_protocol_method() util.

class Extensions:
    def get_extension_for_oid(self):
        for _ in self:
            pass

    __len__, __iter__ = lambda x: x

Traceback (most recent call last):
  File "/Users/.../pylint/pylint/lint/pylinter.py", line 1130, in _check_files
    self._check_file(get_ast, check_astroid_module, file)
  File "/Users/.../pylint/pylint/lint/pylinter.py", line 1165, in _check_file
    check_astroid_module(ast_node)
  File "/Users/.../pylint/pylint/lint/pylinter.py", line 1317, in check_astroid_module
    retval = self._check_astroid_module(
  File "/Users/.../pylint/pylint/lint/pylinter.py", line 1364, in _check_astroid_module
    walker.walk(node)
  File "/Users/.../pylint/pylint/utils/ast_walker.py", line 76, in walk
    self.walk(child)
  File "/Users/.../pylint/pylint/utils/ast_walker.py", line 76, in walk
    self.walk(child)
  File "/Users/.../pylint/pylint/utils/ast_walker.py", line 76, in walk
    self.walk(child)
  File "/Users/.../pylint/pylint/utils/ast_walker.py", line 73, in walk
    callback(astroid)
  File "/Users/.../pylint/pylint/checkers/typecheck.py", line 2060, in visit_for
    self._check_iterable(node.iter)
  File "/Users/.../pylint/pylint/checkers/typecheck.py", line 2044, in _check_iterable
    if not is_iterable(inferred, check_async=check_async):
  File "/Users/.../pylint/pylint/checkers/utils.py", line 1177, in is_iterable
    return _supports_protocol(value, protocol_check)
  File "/Users/.../pylint/pylint/checkers/utils.py", line 1153, in _supports_protocol
    if protocol_callback(value):
  File "/Users/.../pylint/pylint/checkers/utils.py", line 1096, in _supports_iteration_protocol
    return _supports_protocol_method(value, ITER_METHOD) or _supports_protocol_method(
  File "/Users/.../pylint/pylint/checkers/utils.py", line 1070, in _supports_protocol_method
    if isinstance(first.parent.value, nodes.Const):
  File "/Users/.../astroid/astroid/bases.py", line 111, in __getattr__
    return getattr(self._proxied, name)
AttributeError: 'ClassDef' object has no attribute 'value'