列表推导式

1numbers = [1, 2, 3, 4, 5]
2
3# 1. 初始化一个空列表
4squares = []
5
6# 2. 遍历序列
7for number in numbers:
8    # 3. 添加转换后的值
9    squares.append(number ** 2)
10
11print(squares)

代码示例

1[expression for item in iterable]

1numbers = [1, 2, 3, 4, 5]
2
3# 在一行中创建列表
4squares = [number ** 2 for number in numbers]
5
6print(squares)

1names = ["alice", "bob", "charlie"]
2
3# 对每个名字应用 .title() 方法
4formatted_names = [name.title() for name in names]
5
6print(formatted_names)

1years = [1990, 2000, 2010, 2020]
2
3# 从整数列表创建字符串列表
4labels = [str(year) for year in years]
5
6print(years)
7print(labels)