== Why is this an issue?

Developers may define a list named ``++__all__++`` in a module to limit the names imported from it by wildcard imports (``++from mymodule import *++``). This list can only reference defined names, otherwise an ``++AttributeError++`` will be raised when the module is imported.


=== Noncompliant code example

[source,python]
----
from mymodule import my_func

__all__ = ["unknown_func"]  # Noncompliant. "unknown_func" is undefined
----


=== Compliant solution

[source,python]
----
from mymodule import my_func

__all__ = ["my_func"]
----


== Resources

* https://docs.python.org/3/tutorial/modules.html#importing-from-a-package[Python documentation  - Importing * From a Package]



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