[Python-checkins] [python/cpython] 12d6b5: bpo-30398: Add a docstring for re.error. (#1647)

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/python/cpython
  Commit: 12d6b5d156377c0877931a03ef2439dccb2f3711
      https://github.com/python/cpython/commit/12d6b5d156377c0877931a03ef2439dccb2f3711
  Author: Serhiy Storchaka <storchaka at gmail.com>
  Date:   2017-05-27 (Sat, 27 May 2017)

  Changed paths:
    M Doc/library/re.rst
    M Lib/sre_constants.py

  Log Message:
  -----------
  bpo-30398: Add a docstring for re.error. (#1647)

Also document that some attributes may be None.