Josh Rosenberg <shadowranger+pyt...@gmail.com> added the comment:

Ah, right. It doesn't actually validate the mode string (it just stores it for 
when open is called, assuming open will validate it). So yeah, it silently 
accepts any string, not just valid mode strings. Not a contractual guarantee or 
anything, just how FileType.__init__ is implemented.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue37150>
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