Serhiy Storchaka added the comment:
> And if os.open were supplied in os.py:
>
> @inspect.override_string_representation('mode',
> 'os.O_CREAT | os.O_RDWR')
> def open(file, flags, mode=0o777, *, dir_fd=None):
Other use case is a sentinel default. "foo(arg={})" looks better than
"foo(arg=<object object>)" for function which use a sentinel idiom:
_sentinel = object()
def foo(arg=_sentinel):
if arg is _sentinel:
arg = {}
...
Sometimes full signature overwriting is needed (see for example Python
implementation of operator.methodcaller() in issue16694).
----------
nosy: +serhiy.storchaka
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<http://bugs.python.org/issue16801>
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