[issue20173] Derby #4: Convert 53 sites to Argument Clinic across 5 files

[Vajrasky Kok]

Vajrasky Kok added the comment:

So, as Guide said in https://mail.python.org/pipermail/python-dev/2014-January/131675.html:

"In the sha1 example, however, accepting None and converting it to NULL
(without a reference leak, please :-) seems fine though."

I let the patches as they are.

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