Python之集合生成式

集合生成式相关示例

一、例如生成集合{1,4,9,16,25}

# for in 循环实现S = set()for i in range(1,7):    S.add(i * i)print(S) # {1, 4, 36, 9, 16, 25}# 集合生成式S = { i * i for i in range(1,7)}print(S) # {1, 4, 36, 9, 16, 25}

二、 嵌套if

# for in 循环嵌套ifS = set()for i in range(1,7):    if i % 2:        S.add(i * i)print(S)# 集合生成式S = { i * i for i in range(1,7) if i % 2}print(S)

三、循环嵌套

# for in 循环S = set()for i in range(1,4):    for j in range(1,4):        S.add((i,j))print(S)# 集合生成式S = { (i,j) for i in range(1,4) for j in range(1,4)}print(S)