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no-member / E1101ΒΆMessage emitted:
%s %r has no %r member%s
Description:
Used when a variable is accessed for a nonexistent member.
Problematic code:
from pathlib import Path
directories = Path(".").mothers # [no-member]
class Cat:
def meow(self):
print("Meow")
Cat().roar() # [no-member]
Correct code:
from pathlib import Path
directories = Path(".").parents
class Cat:
def meow(self):
print("Meow")
Cat().meow()
Additional details:
If you are getting the dreaded no-member error, there is a possibility that either:
pylint found a bug in your code
You're launching pylint without the dependencies installed in its environment
pylint would need to lint a C extension module and is refraining to do so
pylint does not understand dynamically generated code
Linting C extension modules is not supported out of the box, especially since pylint has no way to get an AST object out of the extension module.
But pylint actually has a mechanism which you might use in case you want to analyze C extensions. Pylint has a flag, called extension-pkg-allow-list (formerly extension-pkg-whitelist), through which you can tell it to import that module and to build an AST from that imported module:
$ pylint --extension-pkg-allow-list=your_c_extension
Be aware though that using this flag means that extensions are loaded into the active Python interpreter and may run arbitrary code, which you may not want. This is the reason why we disable by default loading C extensions. In case you do not want the hassle of passing C extensions module with this flag all the time, you can enable unsafe-load-any-extension in your configuration file, which will build AST objects from all the C extensions that pylint encounters:
$ pylint --unsafe-load-any-extension=y
Alternatively, since pylint emits a separate error for attributes that cannot be found in C extensions, c-extension-no-member, you can disable this error for your project.
If something is generated dynamically, pylint won't be able to understand the code from your library (c-extension or not). You can then specify generated attributes with the generated-members option. For example if cv2.LINE_AA and sphinx.generated_member create false positives for no-member, you can do:
$ pylint --generated-member=cv2.LINE_AA,sphinx.generated_member
Created by the typecheck checker.
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