[issue12499] textwrap.wrap: add control for fonts with different character widths

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Both approaches can be combined. It could be a regular overridable method, and it could be overridded for an instance if corresponding argument is specified. See the default method and parameter of JSON encoder.

I slightly hesitate about the name. Is "width_func" the best of names?

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nosy: +serhiy.storchaka
versions: +Python 3.5 -Python 3.3

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