[issue6804] IDLE: Detect Python files even if name doesn't end in .py

[Terry J. Reedy]

Terry J. Reedy added the comment:

#6858 was the issue I referred to.
Recognizing #!...python, common on *nex, which the patch does not do, seems sensible.  I thought about coding line, but general idea is not specific to python.

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stage:  -> patch review
versions: +Python 2.7, Python 3.4, Python 3.5 -Python 3.2

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<http://bugs.python.org/issue6804>
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