[issue38208] Simplify string.Template by using __init_subclass__()

[Serhiy Storchaka]

New submission from Serhiy Storchaka <storchaka+cpython at gmail.com>:

Currently string.Template uses a metaclass. It is possible to get rid of it and use __init_subclass__() instead.

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components: Library (Lib)
messages: 352699
nosy: serhiy.storchaka
priority: normal
severity: normal
status: open
title: Simplify string.Template by using __init_subclass__()
versions: Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38208>
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