When a module is imported using import *, all attributes listed in __all__ are imported. If __all__ includes attributes that are not defined in the module then an exception is triggered. This usually indicates a typographic error in the attributes in __all__ or in the name of the object.

Correct any typographic errors, either in the name of the object or in the string in __all__. If there are no typographic errors, either delete the name from __all__ or add the object to the module.

In the example, the function name spam has been misspelled in the __all__ list. This will result in spamm being highlighted as an undefined export. Correcting the spelling will fix the defect.

Python Language Reference: The import statement.

Python Tutorial: Importing * from a Package.