Python学习第六篇——字典中的键和值

favorite_language ={
    "jen":"python",
    "sarah":"c",
    "edward":"ruby",
    "phil":"python",
    }
for name in sorted(favorite_language.keys()):# sort by zimushunxu
    print(name.title()+",thank you for taking the poll.")
print("
")
for name in favorite_language.keys():
    print(name.title()+",thank you for taking the poll.")
print("
")
print("The folllowing languages have been mentioned:")
for language in favorite_language.values():
    print(language.title())
    
print("
the following languages have been mentioned:")
for language in set(favorite_language.values()):
    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