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bpo-43945: [Enum] reduce scope of new format() behavior (GH-26752)

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* [Enum] reduce scope of new format behavior

Instead of treating all Enums the same for format(), only user mixed-in
enums will be affected.  In other words, IntEnum and IntFlag will not be
changing the format() behavior, due to the requirement that they be
drop-in replacements of existing integer constants.

If a user creates their own integer-based enum, then the new behavior
will apply:

    class Grades(int, Enum):
        A = 5
        B = 4
        C = 3
        D = 2
        F = 0

Now:  format(Grades.B)  -> DeprecationWarning and '4'
3.12:                   -> no warning, and 'B'
This commit is contained in:
Ethan Furman 2021-06-18 13:15:46 -07:00 • committed by GitHub
parent df1502e47f
commit f60b07ab6c
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5 changed files with 225 additions and 29 deletions
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4
Lib/test/test_httpservers.py
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@ -259,7 +259,7 @@ def test_send_error(self):
for code in (HTTPStatus.NO_CONTENT, HTTPStatus.NOT_MODIFIED,
HTTPStatus.PROCESSING, HTTPStatus.RESET_CONTENT,
HTTPStatus.SWITCHING_PROTOCOLS):
self.con.request('SEND_ERROR', '/{:d}'.format(code))
self.con.request('SEND_ERROR', '/{}'.format(code))
res = self.con.getresponse()
self.assertEqual(code, res.status)
self.assertEqual(None, res.getheader('Content-Length'))
@ -276,7 +276,7 @@ def test_head_via_send_error(self):
for code in (HTTPStatus.OK, HTTPStatus.NO_CONTENT,
HTTPStatus.NOT_MODIFIED, HTTPStatus.RESET_CONTENT,
HTTPStatus.SWITCHING_PROTOCOLS):
self.con.request('HEAD', '/{:d}'.format(code))
self.con.request('HEAD', '/{}'.format(code))
res = self.con.getresponse()
self.assertEqual(code, res.status)
if code == HTTPStatus.OK: