For each set of args, makes a copy of the function with the args bound, and with the repr of the args appended to the name. Assigns that to the calling frame's locals. Adapted from http://stackoverflow.com/a/4455312/278488. Meant for use with unit tests, to create multiple tests from a parameterized method.

expand_with_args.py

def expand_with_args(*parameters, **kwargs):
    """
    For each set of args, makes a copy of the function with the args bound, and
    with the repr of the args appended to the name. Assigns that to the calling
    frame's locals. Adapted from http://stackoverflow.com/a/4455312/278488.
    Meant for use with unit tests, to create multiple tests from a parameterized
    method.
    """
    def tuplify(x):
        if not isinstance(x, tuple):
            return x,
        return x

    def _arg_namer(arg):
        return repr(arg)
    arg_namer = kwargs.pop('arg_namer', _arg_namer)

    def _args_namer(*args):
        return ",".join(arg_namer(arg) for arg in args)
    args_namer = kwargs.pop('args_namer', _args_namer)

    if kwargs:
        raise TypeError('Unexpected keyword arguments %r' % kwargs)

    def decorator(method, parameters=parameters):
        for parameter in (tuplify(x) for x in parameters):
            def wrapper(self, method=method, parameter=parameter):
                method(self, *parameter)

            name_for_parameter = args_namer(*parameter)
            wrapper.__name__ = "%s(%s)" % (method.__name__, name_for_parameter)
            frame = sys._getframe(1)  # pylint: disable-msg=W0212
            frame.f_locals[wrapper.__name__] = wrapper
        return None
    return decorator