[issue41297] Remove doctest import from heapq

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

Ronald, can modulegraph be made smarter with respect to sections of code guarded by __name__ == '__main__'?    That Python idiom is old and pervasive.

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<https://bugs.python.org/issue41297>
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