input: Write a function to determine if it is possible to get a hash table implementation in Python that supports insert, delete, and retrieve operations by implementing the given class structure and methods. If it is possible, return True; otherwise, return False. If the implementation is empty then return True.
  
  assert implement_hash_table(HashTable) == True
  assert implement_hash_table(NonsenseClass) == False
  assert implement_hash_table([]) == True
output: def implement_hash_table(cls):
      if not cls:
          return True
      try:
          instance = cls()
          instance.insert('key', 'value')
          instance.retrieve('key')
          instance.delete('key')
          return True
      except:
          return False