Source

pypy / lib_pypy / _functools.py

""" Supplies the internal functions for functools.py in the standard library """

class partial:
    """
    partial(func, *args, **keywords) - new function with partial application
    of the given arguments and keywords.
    """
    __slots__ = ['func', 'args', '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

    def __call__(self, *fargs, **fkeywords):
        newkeywords = self.keywords.copy()
        newkeywords.update(fkeywords)
        return self.func(*(self.args + fargs), **newkeywords)
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