Range.py 文件源码

def handleargs(arglist):
    """Take list of arguments and extract/create proper start, stop, and step
    values and return in a tuple"""
    try:
        if len(arglist) == 1:
            return 0, int(arglist[0]), 1
        elif len(arglist) == 2:
            return int(arglist[0]), int(arglist[1]), 1
        elif len(arglist) == 3:
            if arglist[2] == 0:
                raise ValueError("step argument must not be zero")
            return tuple(int(x) for x in arglist)
        else:
            raise TypeError("range() accepts 1-3 arguments, given", len(arglist))
    except TypeError:
        raise TypeError("range() arguments must be numbers or strings "
        "representing numbers")