pylint-dev
False positive ``no-member`` for ``TypedDict.__annotations__``
Bug description
from typing import TypedDict
class Example(TypedDict):
string: str
integer: int
boolean: bool
print(Example.__annotations__)
See https://github.com/PyCQA/pylint/issues/3234#issuecomment-896701002
Configuration
No response
Command used
pylint a.py
Pylint output
a.py:10:6: E1101: Class 'Example' has no '__annotations__' member (no-member)
Expected behavior
No warning
Pylint version
2.15.0-dev0
OS / Environment
No response
Additional dependencies
No response
I often use a construct like this in Python 3.7 and I get that false positive too:
class foobar():
""" … """
foo: str
bar: int
__slots__ = tuple(__annotations__) # __slots__ "on the fly"
def __init__(self, foo, bar):
self.foo = foo
self.bar = bar
test = foobar('foobar', 12345)
$ pylint --version
pylint 2.15.6
astroid 2.12.13
Python 3.7.6 (v3.7.6:43364a7ae0, Dec 18 2019, 14:18:50)
[Clang 6.0 (clang-600.0.57)]
$ pylint thebug1.py
************* Module thebug1
thebug1.py:9:19: E0602: Undefined variable '__annotations__' (undefined-variable)
------------------------------------------------------------------
Your code has been rated at 3.75/10 (previous run: 3.75/10, +0.00)
The issue with __annotations__ seems to have been fixed in the latest release of Pylint:
pylint 3.0.2
astroid 3.0.1
Python 3.11.6 (main, Oct 2 2023, 13:45:54) [GCC 11.4.0]
However, I don't know it it is the same cause, but I am getting no-member errors on TypedDict fields __required_keys__ and __optional_keys__:
from typing import TypedDict
class Example(TypedDict):
string: str
integer: int
boolean: bool
print(Example.__annotations__) # {'string': <class 'str'>, 'integer': <class 'int'>, 'boolean': <class 'bool'>}
print(Example.__required_keys__) # frozenset({'integer', 'string', 'boolean'})
print(Example.__optional_keys__) # frozenset()
no-member.py:11:6: E1101: Class 'Example' has no '__required_keys__' member (no-member)
no-member.py:12:6: E1101: Class 'Example' has no '__optional_keys__' member (no-member)
The issue with annotations seems to have been fixed in the latest release of Pylint:
I added the help wanted label because checking that the bug is fixed by adding a functional test case can be done without pylint knowledge (the CI will check from python 3.8 to python 3.12 on win/mac/linux).
However, I don't know it it is the same cause, but I am getting no-member errors on TypedDict fields required_keys and optional_keys:
This require some investigation (And maybe another issue).
For me the issue is also fixed for TypedDicts defined with the class-based syntax.
It is still there when using the Alternative Syntax though. We use these for TypedDicts whose fields are not valid attribute names in Python, e.g. because they are reserved keywords.
I have the same issue and from my tests it also only happens when using the alternative syntax
from typing import TypedDict
class MyTypedDict(TypedDict):
a: int
b: str
OtherTypedDict = TypedDict('OtherTypedDict', {'a': int, 'b': str})
print(MyTypedDict.__annotations__) # No Error
print(OtherTypedDict.__annotations__) # Error
Instance of
TypedDicthas no__annotations__member E1101:no-member
The issue with
__annotations__seems to have been fixed in the latest release of Pylint:pylint 3.0.2 astroid 3.0.1 Python 3.11.6 (main, Oct 2 2023, 13:45:54) [GCC 11.4.0]
Is not fixed in pylint 3.0.3:
$ pylint --version
pylint 3.0.3
astroid 3.0.3
Python 3.10.12 (main, Nov 20 2023, 15:14:05) [GCC 11.4.0]
$ cat tmp/test.py
class Test:
a: int
b: float
c: str
__slots__ = tuple(__annotations__)
$ pylint tmp/test.py
************* Module test
tmp/test.py:6:22: E0602: Undefined variable '__annotations__' (undefined-variable)
------------------------------------------------------------------
Your code has been rated at 0.00/10 (previous run: 0.00/10, +0.00)
That’s a slightly different case. The thing that was said to be fixed was not about referencing the attribute in the class body itself.
