Serhiy Storchaka added the comment:
For now str(accept={str, NoneType}) is used only 14 times in 6 files in 5
modules. The "z" format unit is used also in still not converted modules
_codecs (a lot of sites), _locale, mmap, _multiprocessing, and _socket. Current
syntax doesn't look so ugly for me. I would wait until we converted more
modules and implemented more converters that don't match existing format units.
Alternative syntax can be "str | NoneType" (without the accept parameter at
all).
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<http://bugs.python.org/issue24145>
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