content: import os
  import shelve
  import tempfile
  
  with tempfile.TemporaryDirectory() as d:
      filename = os.path.join(d, 'shelf')
  
      with shelve.open(filename) as db:
          db['spam'] = {'eggs': 'ham'}
  
      with shelve.open(filename) as db:
          print(db['spam'])
  