Text sorting function for the Czech language
This is a pure-Python library for Czech-language albhabetical sorting.
>>> import czech_sort >>> czech_sort.sorted(['sídliště', 'shoda', 'schody']) ['shoda', 'schody', 'sídliště'] >>> sorted(['sídliště', 'shoda', 'schody'], key=czech_sort.key) ['shoda', 'schody', 'sídliště']
On the command line:
$ python -m czech_sort < file.txt shoda schody sídliště
Why another sorting library?
To sort Python strings in the Czech language, there are three other options:
- Use PyICU. This can sort really well, and do all kinds of wonderful, standards-compliant Unicode things. Perfect for publication-quality results. Unfortunately, ICU can be a major pain to install, making it overkill if you just want to sort a list of strings.
- Set the locale, then use locale.strxfrm. (Yes, strxfrm! Try saying that ten times fast!) This depends on the Czech POSIX locale being available, so it’s hardly portable.
- Just use Python’s built-in string sort. This sorts lexicographically by Unicode codepoints. It might be good enough for you? Maybe?
The czech-sort library is a compromise. It should give you good results in the 99% case.
Do not use this if you need proper sorting of symbols, non-Latin scripts, or diacritics other than Czech/Slovak.
Any other deviation from the relevant standard, ČSN 97 6030, should be considered a bug. However, neither the author nor the community at large have access to the standard, which makes finding such bugs somewhat difficult.
Takes an iterable of strings, and returns a list of them, sorted.
Returns a sort key object for a given string.
This function is suitable as the key for functions like the built-in sorted or list.sort.
The czech-sort library can be used with Python 2.6+ and 3.3+.
Under Python 2, it only accepts unicode strings.
Install this into your virtualenv by running:
pip install czech-sort
Bug reports and comments are welcome at Github.
Patches are also welcome! Source code is hosted at Github:
$ git clone http://github.com/encukou/czech-sort
To run the included tests:
$ pip install pytest $ python -m pytest
If you would like to contribute, but are confused by the above, then please e-mail encukou at gmail dot com.
The project is licensed under the MIT license. May it serve you well.
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