check the status of the pewdiepie vs t-series war from your terminal
install dependencies using pip install sty google-api-python-client
go to https://console.developers.google.com/start/api?id=youtube and create or select a project to use.
after you create or select the project click go to credentials. for the second question select other ui and for the third select public data. click what credentials do i need and copy the api key. create a file called key.txt and paste the key into it and save it.
after setup just execute subgap-cli.py in a terminal and you should be able to see both pewdiepie and t-series sub count and the sub gap