1、列表解析通用格式

[表達(dá)式 for 對(duì)象1 in 迭代對(duì)象 [if 條件1] for 對(duì)象2 in 迭代對(duì)象 [if 條件2] ......] a=range(1,5) b=range(100,105) print([(x,y) for x in a for y in b ]) print([(x,y) for x in a if x%2 ==0 for y in b if y%2 ==0 ]) print([(x,y) for x in a for y in b if (x+y) %2 ==0 ]) [(1, 100), (1, 101), (1, 102), (1, 103), (1, 104), (2, 100), (2, 101), (2, 102), (2, 103), (2, 104), (3, 100), (3, 101), (3, 102), (3, 103), (3, 104), (4, 100), (4, 101), (4, 102), (4, 103), (4, 104)] [(2, 100), (2, 102), (2, 104), (4, 100), (4, 102), (4, 104)] [(1, 101), (1, 103), (2, 100), (2, 102), (2, 104), (3, 101), (3, 103), (4, 100), (4, 102), (4, 104)]

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