ref: f5a4d3f88bfc24abb375b06abab968d82b4cbbc7
dir: /sys/src/cmd/python/Doc/lib/libmain.tex/
\section{\module{__main__} ---
Top-level script environment}
\declaremodule[main]{builtin}{__main__}
\modulesynopsis{The environment where the top-level script is run.}
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:
\begin{verbatim}
if __name__ == "__main__":
main()
\end{verbatim}