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:mod:`__main__` --- Top-level script environment
================================================
.. module:: __main__
:synopsis: The environment where the top-level script is run.
--------------
``'__main__'`` is the name of the scope in which top-level code executes.
A module's __name__ is set equal to ``'__main__'`` when read from
standard input, a script, or from an interactive prompt.
A module can discover whether or not it is running in the main scope by
checking its own ``__name__``, which allows a common idiom for conditionally
executing code in a module when it is run as a script or with ``python
-m`` but not when it is imported::
if __name__ == "__main__":
# execute only if run as a script
main()
For a package, the same effect can be achieved by including a
``__main__.py`` module, the contents of which will be executed when the
module is run with ``-m``.