<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def checkout(branch, quiet=False, as_path=False):
 """Check out that branch Defaults to a quiet checkout, giving no stdout if stdout it wanted, call with quiet = False Defaults to checking out branches If as_path is true, then treat "branch" like a file, i.e. $ git checkout -- branch All errors will pass silently, just returning False except any messages about "you need to resolve your current index" These indicate that the repository is not in a normal state and action by a user is usually needed to resolve that So the exception is allowed to rise probably stopping the script """

    try:
        if as_path:
            branch = '-- %s' % branch
        run('checkout %s %s' % (quiet and '-q' or '', branch))
        return True
    except GitError as e:
        if 'need to resolve your current index' in e.output:
            raise
        return False