[New-bugs-announce] [issue27082] IDLE seriously degrades during and after printing large single line strings

[Raymond Hettinger]

New submission from Raymond Hettinger:

IDLE should check the size of lines in a result string before printing it.  Perhaps it should have a "..." after some user settable limit is reached.

>>> '=' * 100000            # Destroys IDLE
>>> json.load(somebigfile)  # Makes IDLE unusably sluggish

The problem only occurs when an individual line is long:

>>> s = 'some reasonable single line\n' * 1000)
>>> print(s)      # Separate lines are no problem
>>> s             # A big single line repr renders IDLE sluggish

Note, the sluggishness persists across sessions -- a "Restart Shell" doesn't help.

In my Python classes, this is a common and recurring problem that negatively impacts the learner's user experience.

----------
assignee: terry.reedy
components: IDLE
messages: 266041
nosy: rhettinger, terry.reedy
priority: normal
severity: normal
status: open
title: IDLE seriously degrades during and after printing large single line strings
type: resource usage

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27082>
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