[issue20530] Change the text signature format (again) to be more robust

[Jesús Cea Avión]

Jesús Cea Avión added the comment:

Preparing a presentation about Python Magic methods I found something weird: (Python 3.4)

"""
>>> help(int.__lt__)
Help on wrapper_descriptor:

__lt__(self, value, /)  <- THIS!!
    Return self<value.
"""

I am amused about the "/)" suffix in the signature. It happens to all magic methods.

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nosy: +jcea

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<http://bugs.python.org/issue20530>
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