votes up 2

current prefixlen is %d, cannot have a prefixlen_diff of %d

github stars 49704
Exception Class:

Raise code

    raise ValueError("new prefix must be shorter")
            if prefixlen_diff != 1:
                raise ValueError("cannot set prefixlen_diff and new_prefix")
            prefixlen_diff = self._prefixlen - new_prefix

        new_prefixlen = self.prefixlen - prefixlen_diff
        if new_prefixlen < 0:
            raise ValueError(
                "current prefixlen is %d, cannot have a prefixlen_diff of %d"
                % (self.prefixlen, prefixlen_diff)
        return self.__class__(
                & (int(self.netmask) << prefixlen_diff),
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