Except clause

[ghost]

BPO	37643
Nosy	@ericvsmith, @tirkarthi

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2019-07-21.14:55:21.451>
created_at = <Date 2019-07-21.12:07:04.389>
labels = ['type-feature', '3.9']
title = 'Except clause'
updated_at = <Date 2019-07-21.14:55:21.438>
user = None

bugs.python.org fields:

activity = <Date 2019-07-21.14:55:21.438>
actor = 'eric.smith'
assignee = 'none'
closed = True
closed_date = <Date 2019-07-21.14:55:21.451>
closer = 'eric.smith'
components = []
creation = <Date 2019-07-21.12:07:04.389>
creator = '\xd0\x90\xd1\x80\xd1\x82\xd1\x83\xd1\x80 \xd0\x93\xd1\x80\xd0\xb8\xd0\xb3\xd0\xbe\xd1\x80\xd1\x8c\xd0\xb5\xd0\xb2'
dependencies = []
files = []
hgrepos = []
issue_num = 37643
keywords = []
message_count = 3.0
messages = ['348238', '348243', '348248']
nosy_count = 3.0
nosy_names = ['eric.smith', 'xtreak', '\xd0\x90\xd1\x80\xd1\x82\xd1\x83\xd1\x80 \xd0\x93\xd1\x80\xd0\xb8\xd0\xb3\xd0\xbe\xd1\x80\xd1\x8c\xd0\xb5\xd0\xb2']
pr_nums = []
priority = 'normal'
resolution = 'postponed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue37643'
versions = ['Python 3.9']

[ghost]

Is is possible to add to Python the following syntax (keyword 'except'):
[1, 2, 3, 4, 5] except [2]
>>> [1, 3, 4, 5]

[tirkarthi]

I guess you are popping 2 from the list and using except for the same. New syntax and semantics needs to be discussed in python-ideas mailing list. Though this reads like English except is used for exception based semantics. I would propose closing this and reopen if it's agreed by core devs in the mailing list.

[ericvsmith]

Yes, this should be discussed on python-ideas first, so I'm closing it here.

But to be honest with you, there's really no chance this would get accepted. It's just too easy to do it with existing list comprehension syntax, which is much more general purpose.

>>> [v for v in [1, 2, 3, 4, 5] if not v in [2]]
[1, 3, 4, 5]