Why does "a == x or y or z" always evaluate to True?

pythonbooleanboolean-expression
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Short description of the scoping rules?

pythonscopedynamic-languages
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Why is the command bound to a Button or event executed when declared?

pythontkinter
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How do I select rows from a DataFrame based on column values?

pythonpandasdataframe
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How do I execute a program or call a system command?

pythonshellterminalsubprocesscommand
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unit-testingbitwise-operatorsfirefoxnatural-sortpython-requestsintnansql-injectionsyntax-erroremail-validationdllrecursionvarcompatibilitypython-decoratorsc-stringsgraphqlregexdjango-modelsasset-pipeline