[issue36793] Do not define unneeded __str__ equal to __repr__

[Serhiy Storchaka]

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


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title: Do not set tp_str -> Do not define unneeded __str__ equal to __repr__

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36793>
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