Terry J. Reedy added the comment:
I have doubts also.
The issue is the same for NotImplemented, though the occurrence is much rarer,
and similar for Ellipsis.
>>> NotImplemented.foo
Traceback (most recent call last):
File "<pyshell#19>", line 1, in <module>
NotImplemented.foo
AttributeError: 'NotImplementedType' object has no attribute 'foo'
>>> Ellipsis.foo
Traceback (most recent call last):
File "<pyshell#20>", line 1, in <module>
Ellipsis.foo
AttributeError: 'ellipsis' object has no attribute 'foo'
Replacing the type name with the object name works for this message, but not
for the type errors.
TypeError: unsupported operand type(s) for +: 'None' and 'int'
is wrong.
Replacing 'NoneType' with 'None' in error messages will break code that does
something like "if 'NoneType' in err.args[0]" in an exception message. The
same replacement would have to be make in user code. Fortunately, it would
continue to work with older versions.
----------
nosy: +terry.reedy
stage: -> test needed
versions: +Python 3.7 -Python 3.6
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