python 3.7 ‘s re module is incompatible with the code

[dorianxiao]

python 3.7 ‘s re module is incompatible with the code，I found a solution, just change the code import re to import regex as re，but should pip3 install regex in command line first.
The previous error is as follows:

[zhujiem]

Thanks for your reporting. But we plan to only support python 2.7 for easy of maintainance.