Recursive force_unicode

deep_force_unicode.py

from django.utils.encoding import force_unicode
from django.utils.functional import Promise

def deep_force_unicode(value):
    """
    Recursively call force_unicode on value.
    """
    if isinstance(value (list, tuple, set)):
        value = type(value)(map(deep_force_unicode, value))
    elif isinstance(value, dict):
        value = type(value)(map(deep_force_unicode, value.items()))
    elif isinstance(value, Promise):
        value = force_unicode(value)
    return value

>>> from django.utils.translation import ugettext_lazy as _
>>> x = {"a": _("foo"), _("b"): [1, 2, _("three"), set([_("baz"), _("bar")])]}
>>> x
{'a': <django.utils.functional.__proxy__ object at 0x101f8c3d0>, <django.utils.functional.__proxy__ object at 0x101f8c310>: [1, 2, <django.utils.functional.__proxy__ object at 0x101f8c390>, set([<django.utils.functional.__proxy__ object at 0x101f8c710>, <django.utils.functional.__proxy__ object at 0x101f8c410>])]}
>>> deep_force_unicode(x)
{'a': u'foo', u'b': [1, 2, u'three', set([u'bar', u'baz'])]}