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26.2. __builtin__ — Built-in objects

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26.4. warnings — Warning control

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26.3. __main__ — Top-level script environment

This module represents the (otherwise anonymous) scope in which the interpreter’s main program executes — commands read either from standard input, from a script file, or from an interactive prompt. It is this environment in which the idiomatic “conditional script” stanza causes a script to run:

if __name__ == “__main__”: