[issue27541] Repr of collection's subclasses

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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dependencies: +Add _PyType_Name()
versions: +Python 3.7 -Python 3.6

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue27541>
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