old_contents: import os
  import sys
  
  
  def fix_imports():
    here = os.path.dirname(__file__)
    dirs = [
        os.path.normpath(os.path.join(here, '..', '..')),
        os.path.normpath(os.path.join(here, 'babel')),
        os.path.normpath(os.path.join(here, 'dulwich')),
        os.path.normpath(os.path.join(here, 'google-apputils-python')),
        os.path.normpath(os.path.join(here, 'httplib2', 'python2')),
        os.path.normpath(os.path.join(here, 'pytz')),
        os.path.normpath(os.path.join(here, 'pyyaml', 'lib2')),
        os.path.normpath(os.path.join(here, 'requests')),
    ]
    sys.path.extend(dirs)
  
new_contents: import os
  import sys
  
  
  def fix_imports():
    here = os.path.dirname(__file__)
    dirs = [
        os.path.normpath(os.path.join(here, '..', '..')),
        os.path.normpath(os.path.join(here, 'babel')),
        os.path.normpath(os.path.join(here, 'dulwich')),
        os.path.normpath(os.path.join(here, 'google-apputils-python')),
        os.path.normpath(os.path.join(here, 'httplib2', 'python2')),
        os.path.normpath(os.path.join(here, 'pytz')),
        os.path.normpath(os.path.join(here, 'pyyaml', 'lib')),
        os.path.normpath(os.path.join(here, 'requests')),
    ]
    sys.path.extend(dirs)
  
subject: Use python2 pyyaml instead of python3.