Derived from the Pyflakes linter.
What it does#
Checks for undefined names in
Why is this bad?#
In Python, the
__all__ variable is used to define the names that are
exported when a module is imported as a wildcard (e.g.,
from foo import *). The names in
__all__ must be defined in the module,
but are included as strings.
Including an undefined name in
__all__ is likely to raise
runtime, when the module is imported.