New submission from Piotr Engelking:
Wrapping a paragraph containing a long word takes a lot of time:
$ time python3 -c 'import textwrap; textwrap.wrap("a" * 2 ** 16)'
real 3m14.923s
user 3m14.792s
sys 0m0.016s
$
A straightforward replacement is 5000 times faster:
$ time python3 -c '("".join(x) for x in zip(*[iter("a" * 2 ** 16)] * 70))'
real 0m0.053s
user 0m0.032s
sys 0m0.016s
$
Tested on Debian with python3.4 3.4.2-1 and python2.7 2.7.8-10.
----------
messages: 229768
nosy: inkerman
priority: normal
severity: normal
status: open
title: horrible performance of textwrap.wrap() with a long word
type: performance
versions: Python 2.7, Python 3.4
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Python tracker <[email protected]>
<http://bugs.python.org/issue22687>
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