New submission from Bernhard M. Wiedemann:
Many python scripts use textwrap to break base64-encoded strings from openssl
into lines - e.g. https://bugs.launchpad.net/python-keystoneclient/+bug/1404402
and https://github.com/diafygi/acme-tiny/blob/master/acme_tiny.py#L166
Steps To Reproduce:
time python -c "import textwrap; textwrap.wrap('x'*9000, 64)"
This has a complexity of O(n^2), meaning wrapping 18000 chars takes 4 times as
long as 9000.
one known workaround is to use
textwrap.wrap('x'*9000, 64, break_on_hyphens=False)
this also has O(n^2) complexity, but is around 2000 times faster.
----------
components: Benchmarks, Extension Modules, Library (Lib), Regular Expressions
messages: 256461
nosy: bmwiedemann, brett.cannon, ezio.melotti, mrabarnett, pitrou
priority: normal
severity: normal
status: open
title: textwrap is very slow on long words without spaces
type: performance
versions: Python 2.7, Python 3.2, Python 3.3, Python 3.4
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue25870>
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