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.

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.

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

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

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

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

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.