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v0.5.1
https://github.com/python/cpython
09 December 2020, 11:06:31 UTC
Revision d48ecebad5ac78a1783e09b0d32c211d9754edf4 authored by Ned Deily on 19 December 2017, 04:53:56 UTC, committed by Ned Deily on 19 December 2017, 04:53:56 UTC 
Update to 3.6.4
1 parent c7d7f77
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Tip revision: d48ecebad5ac78a1783e09b0d32c211d9754edf4 authored by Ned Deily on 19 December 2017, 04:53:56 UTC
Update to 3.6.4
Tip revision: d48eceb
bkfile.py 
from builtins import open as _orig_open

def open(file, mode='r', bufsize=-1):
    if 'w' not in mode:
        return _orig_open(file, mode, bufsize)
    import os
    backup = file + '~'
    try:
        os.unlink(backup)
    except OSError:
        pass
    try:
        os.rename(file, backup)
    except OSError:
        return _orig_open(file, mode, bufsize)
    f = _orig_open(file, mode, bufsize)
    _orig_close = f.close
    def close():
        _orig_close()
        import filecmp
        if filecmp.cmp(backup, file, shallow=False):
            import os
            os.unlink(file)
            os.rename(backup, file)
    f.close = close
    return f
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