wjssz added the comment:

I suggest don't change the content of file, just give a message such as:

IDLE can't display non-BMP character (codepoint above 0xFFFF).
A non-BMP character found in Line 23, position 8 of aaaa.py, please open this 
file with other editor.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue21084>
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