python学习2

# 按顺序遍历字典键
# sorted()排序
favorite_languages = {
    'Lily': 'python',
    'Tim': 'c',
    'Tom': 'ruby',
}

for name in sorted(favorite_languages.keys()):
    print(name.title() + ", thank you for taking the poll.")
    

 

# 遍历字典所有值
# values()
favorite_languages = {
    'Lily': 'python',
    'Tim': 'c',
    'Tom': 'ruby',
}

print("The following languages have been mentioned:")
for language in favorite_languages.values():
    print(language. title())
    

 

# 用集合set剔除重复项，集合类似于列表，但每个元素必须是独一无二的
favorite_languages = {
    'Lily': 'python',
    'Tim': 'python',
    'Tom': 'ruby',
}

print("The following languages have been mentioned:")
for language in set(favorite_languages.values()):
    print(language. title())