删除键值对

  1. alien_0 = {'color': 'green', 'points': 5} 
  2. print(alien_0) 
  3. del alien_0['points']
  4. print(alien_0)

3.遍历字典

  1. user_0 = {     
  2.     'username': 'efermi', 
  3.     'first': 'enrico',    
  4.     'last': 'fermi', 
  5. } 
  6. for key, value in user_0.items(): 
  7.     print("\nKey: " + key) 
  8.     print("Value: " + value)

遍历字典中的所有键

  1. favorite_languages = {  
  2.     'jen': 'python',  
  3.     'sarah': 'c',  
  4.     'edward': 'ruby',   
  5.     'phil': 'python',
  6. } 
  7. for name in favorite_languages.keys():  
  8.     print(name.title())