Would be nice to have a future import that turned off old except style

[ZaheerMerali]

BPO	13767
Nosy	@benjaminp, @ezio-melotti

^{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 2012-01-11.14:05:38.307>
created_at = <Date 2012-01-11.13:24:51.960>
labels = ['interpreter-core', 'type-feature']
title = 'Would be nice to have a future import that turned off old except style'
updated_at = <Date 2012-01-11.14:05:38.296>
user = 'https://bugs.python.org/ZaheerMerali'

bugs.python.org fields:

activity = <Date 2012-01-11.14:05:38.296>
actor = 'benjamin.peterson'
assignee = 'none'
closed = True
closed_date = <Date 2012-01-11.14:05:38.307>
closer = 'benjamin.peterson'
components = ['Interpreter Core']
creation = <Date 2012-01-11.13:24:51.960>
creator = 'Zaheer.Merali'
dependencies = []
files = []
hgrepos = []
issue_num = 13767
keywords = []
message_count = 3.0
messages = ['151058', '151059', '151060']
nosy_count = 3.0
nosy_names = ['benjamin.peterson', 'ezio.melotti', 'Zaheer.Merali']
pr_nums = []
priority = 'normal'
resolution = 'rejected'
stage = None
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue13767'
versions = ['Python 2.7']

[ZaheerMerali]

It would be nice to have a future import to be able to prevent people in code doing:

try:
....
except Exception, e:
....

and make people do:

try:
....
except Exception as e:
....

[ezio-melotti]

If you run python with the -3 flag you should get a warning about that. If you combine it with -We you should be able to get an error instead of a warning. Note however that both the flags are not specific for the "except" but also generate/affect other warnings as well.

[benjaminp]

Unfortunately, that would be a new feature, so it is not acceptable to Python 2.7.