python一个URL拼接的写法

此方法来自网络，很强大

from urlparse import urljoin
from urlparse import urlparse
from urlparse import urlunparse
from posixpath import normpath

def myjoin(base, url):
    url1 = urljoin(base, url)
    arr = urlparse(url1)
    path = normpath(arr[2])
    return urlunparse((arr.scheme, arr.netloc, path, arr.params, arr.query, arr.fragment))

经测试可正确拼接下列形式

1. base1 = 'http://www.bagtree.com/'   url1 = '../../themes/bagtree_2011/images/pinzhi.gif'
2. base2 = 'http://info.ceo.hc360.com/list/qygl-ldl.shtml'   url2 = '/2011/11/250020188368.shtml'
3. base3 = 'http://info.ceo.hc360.com/2012/07/190833206838.shtml'   url3 = '190833206838-2.shtml'