Serhiy Storchaka added the comment:
Because tp_name is a pointer to null-terminated C string and there is no way to
distinguish the name containg the null byte from the name terminated by null
byte. tp_name is used for example in error messages.
>>> t = type('B\0C', (), {})
>>> t.__name__
'B\x00C'
>>> t() + 0
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: unsupported operand type(s) for +: 'B' and 'int'
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<http://bugs.python.org/issue25961>
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