from __future__ import unicode_literals used
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from __future__ import unicode_literals
This code is designed to make the code written in the python2 version adapt to the new specification of python3.
If you write code in the python2 environment that will run in the python3 environment in the future, you can bring this statement.
The purpose of its implementation is to uniformly convert all current strings to unicode encoding format.
Some possible errors can be referred to:
https://blog.csdn.net/hyholine/article/details/54142263