[issue8604] Adding an atomic FS write API

[STINNER Victor]

STINNER Victor added the comment:

atomic_write.patch calls os.replace(src, dst) whereas the src file is open. It works on Linux, but it sounds a little bit strange to me and may fail on other platforms.

Here is another patch (atomic_write_mkstemp.patch) using tempfile.mkstemp() instead of tempfile.NamedTemporaryFile(delete=True) to control when the file is closed and removed.

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Added file: http://bugs.python.org/file30275/atomic_write_mkstemp.patch

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