old_contents: # Author: Tom Richter
  
  import contextlib
  import os
  import shutil
  import sys
  import tempfile
  
  
  class _Devnull(object):
  
      def write(self, _):
          pass
  
  
  @contextlib.contextmanager
  def quiet():
      stdout_save = sys.stdout
      sys.stdout = _Devnull()
      try:
          yield
      finally:
          sys.stdout = stdout_save
  
  
  @contextlib.contextmanager
  def tempdir(delete=True, change_dir=True):
      if delete:
          tempdir = tempfile.mkdtemp(prefix='qopen_test')
      else:
          tempdir = os.path.join(tempfile.gettempdir(), 'qopen_test_permanent')
          if not os.path.exists(tempdir):
              os.mkdir(tempdir)
      if change_dir:
          cwd = os.getcwd()
          os.chdir(tempdir)
      try:
          yield tempdir
      finally:
          if change_dir:
              os.chdir(cwd)
          if delete and os.path.exists(tempdir):
              shutil.rmtree(tempdir)
  
new_contents: # Author: Tom Richter
  
  import contextlib
  import os
  import shutil
  import sys
  import tempfile
  
  
  class _Devnull(object):
  
      def write(self, _):
          pass
  
  
  @contextlib.contextmanager
  def quiet():
      stdout_save = sys.stdout
      sys.stdout = _Devnull()
      try:
          yield
      finally:
          sys.stdout = stdout_save
  
  
  @contextlib.contextmanager
  def tempdir(delete=True, change_dir=True):
      if delete:
          tempdir = tempfile.mkdtemp(prefix='rf_test')
      else:
          tempdir = os.path.join(tempfile.gettempdir(), 'rf_test_permanent')
          if not os.path.exists(tempdir):
              os.mkdir(tempdir)
      if change_dir:
          cwd = os.getcwd()
          os.chdir(tempdir)
      try:
          yield tempdir
      finally:
          if change_dir:
              os.chdir(cwd)
          if delete and os.path.exists(tempdir):
              shutil.rmtree(tempdir)
  
subject: change tempdir