[issue38739] pyperformance html5lib cannot import Mapping (and fails)

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> FYI: this affects tornado_http and django_template as well.

Please report pyperformance issues at:
https://github.com/python/pyperformance/issues

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38739>
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