fix codacy on master

[smilesun]

one could find all coding style problems here: (GO TO MASTER BRANCH!!)

https://app.codacy.com/gh/marrlab/DomainLab/dashboard?branch=fbopt (need login with github)

Click on code style: one get https://app.codacy.com/gh/marrlab/DomainLab/issues?categoryType=CodeStyle&bid=37559465

choose those one could fix and fix them

[smilesun]

https://stackoverflow.com/questions/54586757/how-do-i-automatically-fix-lint-issues-reported-by-pylint