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""" Supplies the internal functions for functools.py in the standard library """
# reduce() has moved to _functools in Python 2.6+.
reduce = reduce
class partial(object):
"""
partial(func, *args, **keywords) - new function with partial application
of the given arguments and keywords.
"""
def __init__(self, func, *args, **keywords):
if not callable(func):
raise TypeError("the first argument must be callable")
self._func = func
self._args = args
self._keywords = keywords or None
def __delattr__(self, key):
if key == '__dict__':
raise TypeError("a partial object's dictionary may not be deleted")
object.__delattr__(self, key)
@property
def func(self):
return self._func
@property
def args(self):
return self._args
@property
def keywords(self):
return self._keywords
def __call__(self, *fargs, **fkeywords):
if self.keywords is not None:
fkeywords = dict(self.keywords, **fkeywords)
return self.func(*(self.args + fargs), **fkeywords)
def __reduce__(self):
d = dict((k, v) for k, v in self.__dict__.iteritems() if k not in
('_func', '_args', '_keywords'))
if len(d) == 0:
d = None
return (type(self), (self.func,),
(self.func, self.args, self.keywords, d))
def __setstate__(self, state):
self._func, self._args, self._keywords, d = state
if d is not None:
self.__dict__.update(d)
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