misc.py 文件源码

def pow(x, y, z=_SENTINEL):
        """
        pow(x, y[, z]) -> number

        With two arguments, equivalent to x**y.  With three arguments,
        equivalent to (x**y) % z, but may be more efficient (e.g. for ints).
        """
        # Handle newints
        if isinstance(x, newint):
            x = long(x)
        if isinstance(y, newint):
            y = long(y)
        if isinstance(z, newint):
            z = long(z)

        try:
            if z == _SENTINEL:
                return _builtin_pow(x, y)
            else:
                return _builtin_pow(x, y, z)
        except ValueError:
            if z == _SENTINEL:
                return _builtin_pow(x+0j, y)
            else:
                return _builtin_pow(x+0j, y, z)

    # ``future`` doesn't support Py3.0/3.1. If we ever did, we'd add this:
    #     callable = __builtin__.callable