如何将％3A和％2F转换为python中url中的：和/？

如何在URL中转换replace（％3A和％2F ...）。
URL
https://url/login_data.php?username=user&categoryid=0&URL=https%3A%2F%2Furl%2F%26TIME%3DFri%2520Aug%252005%25202016%252011%3A40%3A14%2520GMT%2B0530%28India%2520Standard%2520Time%29

必需的URL
https://url/login_data.php?username=user&categoryid=0&URL=https://url/&TIME=Sat Aug 06 2016 11:42:36 GMT+0530 (India Standard Time)

我想知道是否有任何简单的方法来做到这一点？

在中python 2.7，使用urllib.unquote：

>>> import urllib
>>> urllib.unquote(urllib.unquote('https://url/login_data.php?username=user&categoryid=0&URL=https%3A%2F%2Furl%2F%26TIME%3DFri%2520Aug%252005%25202016%252011%3A40%3A14%2520GMT%2B0530%28India%2520Standard%2520Time%29'))
'https://url/login_data.php?username=user&categoryid=0&URL=https://url/&TIME=Fri Aug 05 2016 11:40:14 GMT+0530(India Standard Time)'

在中python 3+，使用urllib.parse.unquote

>>> from urllib.parse import unquote
>>> unquote(unquote("https://url/login_data.php?username=user&categoryid=0&URL=https%3A%2F%2Furl%2F%26TIME%3DFri%2520Aug%252005%25202016%252011%3A40%3A14%2520GMT%2B0530%28India%2520Standard%2520Time%29"))
'https://url/login_data.php?username=user&categoryid=0&URL=https://url/&TIME=Fri Aug 05 2016 11:40:14 GMT+0530(India Standard Time)'