[issue5845] rlcompleter should be enabled automatically

[Cherniavsky Beni]

Cherniavsky Beni <beni at google.com> added the comment:

Easily detecting interactive mode is of general interest for customization.

1. What if C also set sys.flags.interactive in "python" mode,
   or exposed sys.flags.implicit_interactive (but with better name)?

2. It's more useful to have a hook called when entering interactive mode,
   rather than a flag that's set from the beginning:

   $ python -i -c 'import sys; print sys.flags.interactive'
   1
   >>> 

   For this, importing _setupinteractive is a step forward;
   calling e.g. sys.__interactivehook__ sounds even better.
   (site.py would set it by default to a function that enables
   rlcompleter, user can always override...)

BTW, drawback of doing any such setup in site.py: "python -S" would 
be unfriendly!

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5845>
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