<!-- Needs the label "good first issue" assigned manually before or after opening --> The 4th point in [style-guildlines](https://github.com/bitcoin-core/gui/blob/master/test/functional/README.md#style-guidelines) mentions a link to `the python lint script` which seems broken <!-- Motivate the issue and explain the solution briefly --> #### Want to work on this issue? For guidance on contributing, please read [CONTRIBUTING.md](https://github.com/bitcoin/bitcoin/blob/master/CONTRIBUTING.md) before opening your pull request.