old_contents: #!/usr/bin/env python3
  """Script to run mypy's test suite against this version of typeshed."""
  
  from pathlib import Path
  import shutil
  import subprocess
  import sys
  import tempfile
  
  
  if __name__ == '__main__':
      with tempfile.TemporaryDirectory() as tempdir:
          dirpath = Path(tempdir)
          subprocess.run(['python2.7', '-m', 'pip', 'install', '--user', 'typing'], check=True)
          subprocess.run(['git', 'clone', '--depth', '1', 'git://github.com/python/mypy',
                          str(dirpath / 'mypy')], check=True)
          subprocess.run([sys.executable, '-m', 'pip', 'install', '-U', '-r',
                          str(dirpath / 'mypy/test-requirements.txt')], check=True)
          shutil.copytree('stdlib', str(dirpath / 'mypy/typeshed/stdlib'))
          shutil.copytree('third_party', str(dirpath / 'mypy/typeshed/third_party'))
          try:
              subprocess.run(['./runtests.py', '-j12'], cwd=str(dirpath / 'mypy'), check=True)
          except subprocess.CalledProcessError as e:
              print('mypy tests failed', file=sys.stderr)
              sys.exit(e.returncode)
          else:
              print('mypy tests succeeded', file=sys.stderr)
              sys.exit(0)
  
new_contents: #!/usr/bin/env python3
  """Script to run mypy's test suite against this version of typeshed."""
  
  from pathlib import Path
  import shutil
  import subprocess
  import sys
  import tempfile
  
  
  if __name__ == '__main__':
      with tempfile.TemporaryDirectory() as tempdir:
          dirpath = Path(tempdir)
          subprocess.run(['python2.7', '-m', 'pip', 'install', '--user', 'typing'], check=True)
          subprocess.run(['git', 'clone', '--depth', '1', 'git://github.com/python/mypy',
                          str(dirpath / 'mypy')], check=True)
          subprocess.run([sys.executable, '-m', 'pip', 'install', '-U', '-r',
                          str(dirpath / 'mypy/test-requirements.txt')], check=True)
          shutil.copytree('stdlib', str(dirpath / 'mypy/typeshed/stdlib'))
          shutil.copytree('third_party', str(dirpath / 'mypy/typeshed/third_party'))
          try:
              subprocess.run(['pytest', '-n12'], cwd=str(dirpath / 'mypy'), check=True)
          except subprocess.CalledProcessError as e:
              print('mypy tests failed', file=sys.stderr)
              sys.exit(e.returncode)
          else:
              print('mypy tests succeeded', file=sys.stderr)
              sys.exit(0)
  
subject: fix mypy-selftest (#2341)