urlparse模块是python 用来解决 URL 相关操作的模块，比如处理从相对url路径得到绝对url路径等。

import urlparse
 
base_url = "http://www.pythonclub.org/python-basic/urlparse"
 
relative_url = "../python-basic/datetime"
 
abs_url = urlparse.urljoin(base_url, relative_url)
 
print abs_url
 
#http://www.pythonclub.org/python-basic/datetime