Python學習第六篇——字典中的鍵和值

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("\n")
for name in favorite_language.keys():
    print(name.title()+",thank you for taking the poll.")
print("\n")
print("The folllowing languages have been mentioned:")
for language in favorite_language.values():
    print(language.title())
    
print("\nthe following languages have been mentioned:")
for language in set(favorite_language.values()):
    print(language.title())

本程序的目的在於訪問字典中的鍵和值.

1 訪問鍵可以用.keys()的方式，實際上，默認的就是訪問鍵，比如 name in favorite_language和 name in favorite_language.keys()中的name 都表示了鍵

2 訪問值可以用.values()類

3 sorted()可以對特定的變量以特定的方式排序,比如如果是數字，以大小的順序排序，如果是字符串,以首字母出現的順序排序