print语句缩进问题
为什么print（'\n')在不同的缩进下打印结果不同？如打印九九乘法表
for i in range(1, 10):
for j in range(1,i+1):
print(i,'x',j,'=',i*j,end=' ')
print('\n')
这样的打印结果正确：
1 x 1 = 1
2 x 1 = 2 2 x 2 = 4
3 x 1 = 3 3 x 2 = 6 3 x 3 = 9
4 x 1 = 4 4 x 2 = 8 4 x 3 = 12 4 x 4 = 16
5 x 1 = 5 5 x 2 = 10 5 x 3 = 15 5 x 4 = 20 5 x 5 = 25
6 x 1 = 6 6 x 2 = 12 6 x 3 = 18 6 x 4 = 24 6 x 5 = 30 6 x 6 = 36
7 x 1 = 7 7 x 2 = 14 7 x 3 = 21 7 x 4 = 28 7 x 5 = 35 7 x 6 = 42 7 x 7 = 49
8 x 1 = 8 8 x 2 = 16 8 x 3 = 24 8 x 4 = 32 8 x 5 = 40 8 x 6 = 48 8 x 7 = 56 8 x 8 = 64
9 x 1 = 9 9 x 2 = 18 9 x 3 = 27 9 x 4 = 36 9 x 5 = 45 9 x 6 = 54 9 x 7 = 63 9 x 8 = 72 9 x 9 = 81
但是把print('\n')放到与上一个print对齐位置
结果却是：
1 x 1 = 1
2 x 1 = 2
2 x 2 = 4
3 x 1 = 3
3 x 2 = 6
3 x 3 = 9
4 x 1 = 4
4 x 2 = 8
4 x 3 = 12
……
删除print('\n')前面的缩进后结果又是：
1 x 1 = 1 2 x 1 = 2 2 x 2 = 4 3 x 1 = 3 3 x 2 = 6 3 x 3 = 9 4 x 1 = 4 4 x 2 = 8 4 x 3 = 12 4 x 4 = 16 5 x 1 = 5 5 x 2 = 10 5 x 3 = 15 5 x 4 = 20 5 x 5 = 25 6 x 1 = 6 6 x 2 = 12 6 x 3 = 18 6 x 4 = 24 6 x 5 = 30 6 x 6 = 36 7 x 1 = 7 7 x 2 = 14 7 x 3 = 21 7 x 4 = 28 7 x 5 = 35 7 x 6 = 42 7 x 7 = 49 8 x 1 = 8 8 x 2 = 16 8 x 3 = 24 8 x 4 = 32 8 x 5 = 40 8 x 6 = 48 8 x 7 = 56 8 x 8 = 64 9 x 1 = 9 9 x 2 = 18 9 x 3 = 27 9 x 4 = 36 9 x 5 = 45 9 x 6 = 54 9 x 7 = 63 9 x 8 = 72 9 x 9 = 81
这个程序大循环每循环一次打印一行，小循环每循环一次打印一条。
所以要在小循环外大循环内换行！ for i in range(1, 10):
for j in range(1,i+1):
print(i,'x',j,'=',i*j,end=' ')#每行打印i个表达式，每一次打印后以空格间隔
print('\n') # 缩进同for j 循环， 所以要等 for j 循环正常执行完成以后，既打印i 个元素后，再打印换行
print（'\n') 放置在何处，要看需求。
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