[issue31844] HTMLParser: undocumented not implemented method

[William Ayd]

William Ayd <william.ayd at gmail.com> added the comment:

Would we be open to setting the meta class of the ParserBase to ABCMeta and setting error as an abstract method? That at the very least would make the expectation clearer for subclasses. 

I haven’t contributed to Python before but am open to this as a first attempt if the direction makes sense.

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nosy: +William Ayd

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<https://bugs.python.org/issue31844>
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