How to use the feature branch of someone else's pull request

When reviewing pull requests, it can be helpful or necessary to run the respective feature branch. One way to accomplish that is to add the contributor's fork as a remote repository, fetch the branch, and then check it out locally:

git remote add coworker https://github.com/coworker/pysiaf.git

git fetch coworker

git checkout --track coworker/branchname

(see https://stackoverflow.com/questions/5884784/how-to-pull-remote-branch-from-somebody-elses-repo)

Note that the same can easily be accomplished with a few clicks using git clients like sourcetree as well.