How to decode a quoted URL in Python?

How to decode a quoted URL in Python? For example, an quoted URL as follows

https://www.example.com/tag/%E9%93%B6%E8%A1%8C/

should be decoded to

https://www.example.com/tag/银行/

---

In Python 3, we can use `urllib.parse_plus()` (for URL only). One example is as follows.

$ python3
Python 3.6.8 (default, Oct  7 2019, 12:59:55) 
[GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import urllib.parse
>>> url = "https://www.example.com/tag/%E9%93%B6%E8%A1%8C/";
>>> urllib.parse.unquote_plus(url)
'https://www.example.com/tag/银行/'
>>> 

In Python 2, the similar function is `urllib.parse.parse_qs()`.