[issue28850] Regression in Python 3: Subclassing PrettyPrinter.format doesn't work anymore

[Irit Katriel]

Change by Irit Katriel <iritkatriel at yahoo.com>:


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nosy: +serhiy.storchaka

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue28850>
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