Comment by mherrmann

OP struggles with XPaths in complex DOMs. This is a solved problem. Use Helium [1] to write test code that acts on what the user sees:

  start_chrome('github.com/login')
  write('user', into='Username')
  write('pw', into='Password')
  click('Sign in')

I am the author of Helium. It's a wrapper around Selenium. It's fully open source. Under the hood, it uses Selenium 3, which is old. But boy does it work beautifully.

1: https://github.com/mherrmann/selenium-python-helium