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Move a file in the safest way possible::
>>> from django.core.files.move import file_move_safe
>>> file_move_safe("/tmp/old_file", "/tmp/new_file")
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Move a file from one location to another in the safest way possible.
First, try ``os.rename``, which is simple but will break across filesystems.
If that fails, stream manually from one file to another in pure Python.
If the destination file exists and ``allow_overwrite`` is ``False``, raise
``FileExistsError``.
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