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4.12. Epilogue

Rather than placing the main at the end of the script, we defined it above (Section 4.5, “The main program”) as a function main() so that the code can be presented in top-down order.

The lines below cause main() to be called, assuming that litsource is the main script. Python sets global variable __name__ to the string '__main__' for the outermost script.

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if  __name__ == '__main__':