[3.10] bpo-46852: Rename float.__set_format__() to float.__setformat__() (GH-31558) by vstinner · Pull Request #31578 · python/cpython

Rename the private undocumented float.set_format() method to
float.setformat() to fix a typo introduced in Python 3.7. The
method is only used by test_float.

The change enables again test_float tests on the float format which
were previously skipped because of the typo.

The typo was introduced in Python 3.7 by bpo-20185
in commit b5c51d3.

(cherry picked from commit 7d03c8b)