Python url wrapper

gistfile1.py

import os

class u(str):
    """
        Class to deal with urls concat.
    """
    def __init__(self, url):
        self.url = str(url)

    def __add__(self, other):
        if isinstance(other, u):
            return u(os.path.join(self.url, other.url))
        else:
            return u(os.path.join(self.url, other))

    def __div__(self, other):
        return self.__add__(other)

    def __unicode__(self):
        return self.url

    def __repr__(self):
        return self.url