[已解决]python 课后练习题

ztt一方

list1 = []
for x in range(10):
    for y in range(10):
        if x%2==0 and y%2 ==0:
            list1.append((x,y))
            print(list1)
为什么这个打印出来是
[(0, 0)]
[(0, 0), (0, 2)]
[(0, 0), (0, 2), (0, 4)]
[(0, 0), (0, 2), (0, 4), (0, 6)]
[(0, 0), (0, 2), (0, 4), (0, 6), (0, 8)]
[(0, 0), (0, 2), (0, 4), (0, 6), (0, 8), (2, 0)]
[(0, 0), (0, 2), (0, 4), (0, 6), (0, 8), (2, 0), (2, 2)]
[(0, 0), (0, 2), (0, 4), (0, 6), (0, 8), (2, 0), (2, 2), (2, 4)]
[(0, 0), (0, 2), (0, 4), (0, 6), (0, 8), (2, 0), (2, 2), (2, 4), (2, 6)]
[(0, 0), (0, 2), (0, 4), (0, 6), (0, 8), (2, 0), (2, 2), (2, 4), (2, 6), (2, 8)]
[(0, 0), (0, 2), (0, 4), (0, 6), (0, 8), (2, 0), (2, 2), (2, 4), (2, 6), (2, 8), (4, 0)]
[(0, 0), (0, 2), (0, 4), (0, 6), (0, 8), (2, 0), (2, 2), (2, 4), (2, 6), (2, 8), (4, 0), (4, 2)]
[(0, 0), (0, 2), (0, 4), (0, 6), (0, 8), (2, 0), (2, 2), (2, 4), (2, 6), (2, 8), (4, 0), (4, 2), (4, 4)]
[(0, 0), (0, 2), (0, 4), (0, 6), (0, 8), (2, 0), (2, 2), (2, 4), (2, 6), (2, 8), (4, 0), (4, 2), (4, 4), (4, 6)]
[(0, 0), (0, 2), (0, 4), (0, 6), (0, 8), (2, 0), (2, 2), (2, 4), (2, 6), (2, 8), (4, 0), (4, 2), (4, 4), (4, 6), (4, 8)]  这样的，（省略了一部分，因为他so长。

最佳答案

月排行榜 / 总排行榜

zltzlt

2019-8-17 17:32:35

把 print 移到 for 循环之外：

1. list1 = []
   
2. for x in range(10):
   
3.     for y in range(10):
   
4.         if x % 2 == 0 and y % 2 == 1:
   
5.             list1.append((x, y))
   
6. print(list1)

复制代码

跳转到最佳答案楼层

ztt一方

而 >>> list1 = [(x, y) for x in range(10) for y in range(10) if x%2==0 if y%2!=0]   这个打印出来是[(0, 1), (0, 3), (0, 5), (0, 7), (0, 9), (2, 1), (2, 3), (2, 5), (2, 7), (2, 9), (4, 1), (4, 3), (4, 5), (4, 7), (4, 9), (6, 1), (6, 3), (6, 5), (6, 7), (6, 9), (8, 1), (8, 3), (8, 5), (8, 7), (8, 9)]  这样的，我是按照小甲鱼给出的答案打出来的啊

zltzlt

把 print 移到 for 循环之外：

1. list1 = []
   
2. for x in range(10):
   
3.     for y in range(10):
   
4.         if x % 2 == 0 and y % 2 == 1:
   
5.             list1.append((x, y))
   
6. print(list1)

复制代码