PFA patch to fix PEP-8 issues in Tools module's python code.
How to run,
1) Apply patch RM#3063
2) activate virtual environemt
3) Install pycodestyle (formerly called pep8) module from requirements.txt
4) Navigate to ../web directory and run following
pycodestyle --config=.pycodestyle ./pgadmin/tools
In step-4, you can also run yarn run pep8 for whole project but as of now I have fixed only tools module, that's why I'm suggesting you to run it against Tools module only :)