[issue3931] codecs.charmap_build is untested and undocumented

[Marc-Andre Lemburg]

Marc-Andre Lemburg <mal at egenix.com> added the comment:

AFAIR, this code was added by Martin as optimization.

The function is a direct interface to PyUnicode_BuildEncodingMap() which
builds either a dictionary or EncodingMap object for use by the charmap
codec.

It is primarily used by the gencodec.py script.

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assignee:  -> georg.brandl
components: +Documentation
nosy: +georg.brandl, loewis

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