22. 解决方案：列表推导式（选学）

练习解决方案：提取名字 

names = ["Rick Sanchez", "Morty Smith", "Summer Smith", "Jerry Smith", "Beth Smith"]

first_names = [name.split()[0].lower() for name in names]
print(first_names)

输出： 

['rick', 'morty', 'summer', 'jerry', 'beth']

练习解决方案：3 的倍数 

multiples_3 = [x * 3 for x in range(1, 21)]
print(multiples_3)

输出： 

[3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, 51, 54, 57, 60]

练习解决方案：按得分过滤姓名 

scores = {
             "Rick Sanchez": 70,
             "Morty Smith": 35,
             "Summer Smith": 82,
             "Jerry Smith": 23,
             "Beth Smith": 98
          }

passed = [name for name, score in scores.items() if score >= 65]
print(passed)

输出：

该输出中的元素顺序可能有变化，因为字典是无序的。 

['Beth Smith', 'Summer Smith', 'Rick Sanchez']

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