[issue17276] HMAC: deprecate default hash

[Christian Heimes]

Christian Heimes added the comment:

> I don't know how you intend to make `digestmod` mandatory given the current function signature.

That's easy:

if digestmod is None:
    raise TypeError("HMAC needs argument 'digestmod'")

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17276>
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