北 的unicode编码 \u5317
用Python3如何获取北的unicode编码
私以为，如下最优雅↓
'北'.encode('unicode_escape').decode()
http://blog.csdn.net/Setul/article/details/52203894
http://python.jobbole.com/81244/
In [3]: s = "北"
In [5]: s.encode('unicode_escape')
Out[5]: b'\\u5317'