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Update what the locale module documents about string operations.

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Guido van Rossum 2007-10-15 15:42:31 +00:00
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commit 8d2ef875ec
1 changed files with 8 additions and 11 deletions
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Doc/library/locale.rst
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@ -498,26 +498,23 @@ is almost as bad: it is expensive and affects other threads that happen to run
before the settings have been restored.
If, when coding a module for general use, you need a locale independent version
of an operation that is affected by the locale (such as :func:`string.lower`, or
of an operation that is affected by the locale (such as
certain formats used with :func:`time.strftime`), you will have to find a way to
do it without using the standard library routine. Even better is convincing
yourself that using locale settings is okay. Only as a last resort should you
document that your module is not compatible with non-\ ``C`` locale settings.
.. index:: module: string
The case conversion functions in the :mod:`string` module are affected by the
locale settings. When a call to the :func:`setlocale` function changes the
:const:`LC_CTYPE` settings, the variables ``string.lowercase``,
``string.uppercase`` and ``string.letters`` are recalculated. Note that code
that uses these variable through ':keyword:`from` ... :keyword:`import` ...',
e.g. ``from string import letters``, is not affected by subsequent
:func:`setlocale` calls.
The only way to perform numeric operations according to the locale is to use the
special functions defined by this module: :func:`atof`, :func:`atoi`,
:func:`format`, :func:`str`.
There is no way to perform case conversions and character classifications
according to the locale. For (Unicode) text strings these are done according
to the character value only, while for byte strings, the conversions and
classifications are done according to the ASCII value of the byte, and bytes
whose high bit is set (i.e., non-ASCII bytes) are never converted or considered
part of a character class such as letter or whitespace.
.. _embedding-locale: