root/gaphor/tags/gaphor-0.12.0/gaphor/misc/partial.py

"""
Backport of Python2.5 functools.partial method.

>>> import operator
>>> x = partial(operator.add, 2)
>>> x(3)
5

"""

try:
    from functools import partial
except ImportError:

    class partial(object):

        def __init__(*args, **kw):
            self = args[0]
            self.fn, self.args, self.kw = (args[1], args[2:], kw)

        def __call__(self, *args, **kw):
            if kw and self.kw:
                d = self.kw.copy()
                d.update(kw)
            else:
                d = kw or self.kw
            return self.fn(*(self.args + args), **d)


if __name__ == '__main__':
    import doctest
    doctest.testmod()

# vim:sw=4:et