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Showing content from https://mail.python.org/pipermail/python-dev/2001-February/012569.html below:

[Python-Dev] Identifying magic prefix on Python files?

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[Guido]
> If we're going to redesign the .pyc file header, I'd propose the
> following:
>
> (1) magic number -- for file(1), never to be changed
>
> (2) some kind of version -- Python version, or API version, or
>     bytecode version
>
> (3) mtime of .py file
>
> (4) options, e.g. is this a .pyc or a .pyo
>
> (5) size of marshalled code following
>
> (6) marshalled code

Note that the magic number today is different when -U (Py_UnicodeFlag) is
specified.  That should be migrated to #4.

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