Python学习第六篇——字典中的键和值

 1 favorite_language ={
 2     "jen":"python",
 3     "sarah":"c",
 4     "edward":"ruby",
 5     "phil":"python",
 6     }
 7 for name in sorted(favorite_language.keys()):# sort by zimushunxu
 8     print(name.title()+",thank you for taking the poll.")
 9 print("\n")
10 for name in favorite_language.keys():
11     print(name.title()+",thank you for taking the poll.")
12 print("\n")
13 print("The folllowing languages have been mentioned:")
14 for language in favorite_language.values():
15     print(language.title())
16     
17 print("\nthe following languages have been mentioned:")
18 for language in set(favorite_language.values()):
19     print(language.title())

本程序的目的在于访问字典中的键和值.

1 访问键可以用.keys()的方式，实际上，默认的就是访问键，比如 name in favorite_language和 name in favorite_language.keys()中的name 都表示了键

2 访问值可以用.values()类

3 sorted()可以对特定的变量以特定的方式排序,比如如果是数字，以大小的顺序排序，如果是字符串,以首字母出现的顺序排序