Message 335497 - Python tracker

Message335497

Author	donovick
Recipients	docs@python, donovick
Date	2019-02-14.06:14:12
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1550124852.78.0.300044847884.issue35992@roundup.psfhosted.org>
In-reply-to

Content
OS: Debian testing python3 -VV: Python 3.7.2+ (default, Feb 2 2019, 14:31:48) [gcc 8.2.0] The following: ``` class Meta(type): pass class X(metaclass=Meta): def __class_getitem__(cls, key): return key X[10] ``` Results in ``` TypeError: 'Meta' object does not support indexing ``` However, PEP 560 specifically states that __class_getitem__ should be used as fall back for when a metaclass does not implement __getitem__.

Content

OS:
Debian testing

python3 -VV:
Python 3.7.2+ (default, Feb  2 2019, 14:31:48)
[gcc 8.2.0]


The following:
```
class Meta(type): pass

class X(metaclass=Meta):
    def __class_getitem__(cls, key):
        return key

X[10]
```
Results in 
```
TypeError: 'Meta' object does not support indexing
```

However, PEP 560 specifically states that __class_getitem__ should be used as fall back for when a metaclass does not implement __getitem__.

History
Date	User	Action	Args
2019-02-14 06:14:12	donovick	set	recipients: + donovick, docs@python
2019-02-14 06:14:12	donovick	set	messageid: <1550124852.78.0.300044847884.issue35992@roundup.psfhosted.org>
2019-02-14 06:14:12	donovick	link	issue35992 messages
2019-02-14 06:14:12	donovick	create