Allow using symbols from Unicode block "Superscripts and Subscripts" in identifiers

[rominf]

BPO	21405
Nosy	@pitrou, @vstinner, @ezio-melotti, @merwok, @stevendaprano

^{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 2014-05-04.09:58:20.955>
created_at = <Date 2014-05-01.06:44:55.081>
labels = ['type-feature', 'expert-unicode']
title = 'Allow using symbols from Unicode block "Superscripts and Subscripts" in identifiers'
updated_at = <Date 2014-05-04.09:58:20.940>
user = 'https://bugs.python.org/rominf'

bugs.python.org fields:

activity = <Date 2014-05-04.09:58:20.940>
actor = 'rominf'
assignee = 'none'
closed = True
closed_date = <Date 2014-05-04.09:58:20.955>
closer = 'rominf'
components = ['Unicode']
creation = <Date 2014-05-01.06:44:55.081>
creator = 'rominf'
dependencies = []
files = []
hgrepos = []
issue_num = 21405
keywords = []
message_count = 7.0
messages = ['217681', '217687', '217692', '217696', '217765', '217766', '217864']
nosy_count = 6.0
nosy_names = ['pitrou', 'vstinner', 'ezio.melotti', 'eric.araujo', 'steven.daprano', 'rominf']
pr_nums = []
priority = 'normal'
resolution = 'rejected'
stage = None
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue21405'
versions = ['Python 3.5']

[rominf]

It's really useful that python 3 allows me to use some Unicode symbols (as specified in https://docs.python.org/3.4/reference/lexical_analysis.html#identifiers), especially Greek symbols for mathematical programs. But when I write mathematical program with lots of indices I would like to use symbols from block "Superscripts and Subscripts" (as id_continue), for example:

⁴₂₍₎

I don't see any problems with allowing yet another subset of Unicode symbols. In Julia, for example, I can use them without problems.

[stevendaprano]

3.1, 3.2, 3.3 and 3.4 are all in feature-freeze, so this is only an option for 3.5.

A very tentative +1 on this feature. But I fear it may need to be discussed on python-ideas first.

[pitrou]

I think python-dev or python-ideas should indeed be consulted before.

[rominf]

I'm sorry, I didn't now that bugtracker is not for features discussing. I'll wrote the letter to the python-ideas: https://groups.google.com/forum/#!topic/python-ideas/yjR7j9TSFeE

[merwok]

Many features are indeed discussed on this bug tracker, but for a big change like the one you propose we like to reach out to all of python-dev or all people on python-ideas to discuss pros and cons. The devguide should explain this in a little more detail.

I don't know if the google group you posted to is a read-only or two-way mirror; the real list is found at https://mail.python.org/mailman/listinfo/python-ideas

[merwok]

FTR https://docs.python.org/devguide/#proposing-changes-to-python-itself

[rominf]

See later discussion there: https://mail.python.org/pipermail/python-ideas/2014-May/027767.html

Because of https://mail.python.org/pipermail/python-ideas/2014-May/027789.html I'm closing this issue.