[issue39305] Merge nntplib._NNTPBase and nntplib.NNTP

[Luciana]

Luciana <lucianadacostamarques at gmail.com> added the comment:

I just uploaded the PR, please take a look when you have a chance :)

I did my best trying to come up with a good code.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39305>
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