列表理解:每个循环的多维项目

[expression for item in iterable if condition]

squares = [x**2 for x in range(10)]
print(squares)  # 输出: [0, 1, 4, 9, 16, 25, 36, 49, 64, 81]

matrix = [
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9]
]

# 生成一个新的二维列表，其中每个元素是原矩阵中对应元素的平方
squared_matrix = [[x**2 for x in row] for row in matrix]
print(squared_matrix)
# 输出: [[1, 4, 9], [16, 25, 36], [49, 64, 81]]

x = 10
result = [x + i for i in range(5)]
print(result)  # 输出: [10, 11, 12, 13, 14]

# 使用生成器表达式
squares_gen = (x**2 for x in range(10))
for square in squares_gen:
    print(square)  # 按需输出: 0, 1, 4, 9, 16, 25, 36, 49, 64, 81

# 多维列表理解示例
matrix = [
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9]
]

# 生成一个新的二维列表，其中每个元素是原矩阵中对应元素的平方
squared_matrix = [[x**2 for x in row] for row in matrix]
print(squared_matrix)
# 输出: [[1, 4, 9], [16, 25, 36], [49, 64, 81]]