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Yes, please read the release notes.

• aliencat 10y ago
  for reference: http://ipython.readthedocs.io/en/stable/whatsnew/version5.html http://ipython.readthedocs.io/en/stable/whatsnew/version5.ht... tldr; add `c.TerminalInteractiveShell.editing_mode = 'vi'` to ipython_config.py