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Michael Devine
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definations
if __name__ == '__main__':
implementation statements
This is block included in modules that contain definations of functions and class types, so that, the implementation statements for testing these definations may be executed on condition that the executing program is the module itself (__name__ == '__main__':).
If the module was imported and executed from another program, then the condition will not be satisfied and the implementation statements will be suppressed.
**This is wondeful feature of Python that enables nesting of modules without worrying about the danger of local implementation statements in the module getting executed in the importing program.
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