install.py 文件源码

def __lt__(self, other):
        if self.context != other.context:
            raise TypeError("{0}.context != {1}.context".format(self, other))

        return self._sort_key < other._sort_key

        # XXX prune

        sn = self.parsed_filename.group('name')
        on = other.parsed_filename.group('name')
        if sn != on:
            return sn < on
        sv = parse_version(self.parsed_filename.group('ver'))
        ov = parse_version(other.parsed_filename.group('ver'))
        if sv != ov:
            return sv < ov
        # Compatibility
        if self.context != other.context:
            raise TypeError("{0}.context != {1}.context".format(self, other))
        sc = self.rank
        oc = other.rank
        if sc is not None and oc is not None and sc != oc:
            # Smaller compatibility ranks are "better" than larger ones,
            # so we have to reverse the sense of the comparison here!
            return sc > oc
        elif sc is None and oc is not None:
            return False
        return self.filename < other.filename