Roger Serwy added the comment:
The only reason that the IDLE shell is slow is due to the shell's text widget
being configured to have wrap="char". If we manually wrapped the output then
the shell responds very quickly to rendering really long strings.
The attached proof-of-concept patch (against 2.7 tip) implements manual
wrapping. You can type "print('a' * 10**6)" and the shell responds almost
instantly when using no-subprocess mode. (The RPC overhead becomes readily
apparent when using a subprocess, introducing a large uninteruptable delay.
That's another issue.)
I left text wrapping enabled in the shell since the user may be using a
variable-spaced font. A possible compromise would be to increase the wrap_index
to a large number, like 32768, before IDLE inserts a '\n' into the output. This
would mimic the wrapping behavior of the original shell, but keep the shell
responsive when you write a very long string to the output.
----------
keywords: +patch
versions: -Python 3.2
Added file: http://bugs.python.org/file29675/manual_wrap.patch
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<http://bugs.python.org/issue1442493>
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