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speaklater ~~~~~~~~~~ A module that provides lazy strings for translations. Basically you get an object that appears to be a string but changes the value every time the value is evaluated based on a callable you provide. For example you can have a global `lazy_gettext` function that returns a lazy string with the value of the current set language. Example: >>> from speaklater import make_lazy_string >>> sval = u'Hello World' >>> string = make_lazy_string(lambda: sval) This lazy string will evaluate to the value of the `sval` variable. >>> string lu'Hello World' >>> unicode(string) u'Hello World' >>> string.upper() u'HELLO WORLD' If you change the value, the lazy string will change as well: >>> sval = u'Hallo Welt' >>> string.upper() u'HALLO WELT' This is especially handy when combined with a thread local and gettext translations or dicts of translatable strings: >>> from speaklater import make_lazy_gettext >>> from threading import local >>> l = local() >>> l.translations = {u'Yes': 'Ja'} >>> lazy_gettext = make_lazy_gettext(lambda: l.translations.get) >>> yes = lazy_gettext(u'Yes') >>> print yes Ja >>> l.translations[u'Yes'] = u'Si' >>> print yes Si Lazy strings are no real strings so if you pass this sort of string to a function that performs an instance check, it will fail. In that case you have to explicitly convert it with `unicode` and/or `string` depending on what string type the lazy string encapsulates. To check if a string is lazy, you can use the `is_lazy_string` function: >>> from speaklater import is_lazy_string >>> is_lazy_string(u'yes') False >>> is_lazy_string(yes) True New in version 1.2: It's now also possible to pass keyword arguments to the callback used with `make_lazy_string`. :copyright: (c) 2010 by Armin Ronacher. :license: BSD, see LICENSE for more details.
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_LazyString Class for strings created by a function call. |
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__package__ = None
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Creates a lazy gettext function dispatches to a gettext function as returned by `lookup_func`. Example: >>> translations = {u'Yes': u'Ja'} >>> lazy_gettext = make_lazy_gettext(lambda: translations.get) >>> x = lazy_gettext(u'Yes') >>> x lu'Ja' >>> translations[u'Yes'] = u'Si' >>> x lu'Si' |
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