Module speaklater
source code
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, text_type
>>> sval = u'Hello World'
>>> string = make_lazy_string(lambda: sval)
This lazy string will evaluate to the value of the `sval` variable.
>>> string
l'Hello World'
>>> text_type(string) == u'Hello World'
True
>>> string.upper() == u'HELLO WORLD'
True
If you change the value, the lazy string will change as well:
>>> sval = u'Hallo Welt'
>>> string.upper() == u'HALLO WELT'
True
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 1.4: python >= 3.3 (and also 2.6 and 2.7) support,
repr(lazystring) is l"foo" on py2 and py3 - no "u" on py2!
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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is_lazy_string(obj)
Checks if the given object is a lazy string. |
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make_lazy_string(__func,
*args,
**kwargs)
Creates a lazy string by invoking func with args. |
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PY2 = True
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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
l'Ja'
>>> translations[u'Yes'] = u'Si'
>>> x
l'Si'
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