Python中的for循环、while循环示例

约定不等于承诺〃 2022-06-16 04:46 346阅读 0赞

**print** **"\\nFFFFFFFFFF****for****循环** **FFFFFFFFFF"**

*\# for-loop打印九九乘法表,金字塔形状*  
rows = range(1,10)  
cols = range(1,10)  
row, col = 1,1  
**for** row **in** rows:  
**for** col **in** cols:  
**if** col <= row:  
**print "%s \* %s = %s\\t"**% (row, col, row \* col),  
**print *\#打印一个空行***  
  
  
\# ----------------------  
**print** **"\\nfor****循环中的****continue****和****break****使用****"**  
i = 3  
**for** x **in** range(10):  
**if** x == i:  
**continue** *\#不执行当次,直接执行下一次*  
**elif** x ==  8:  
**break** *\#退出整个for循环*  
**else**:  
**print** x, *\#加个逗号，打印时不换行*  
  
  
**print "\\n\\nwwwwwwww python中的while循环 wwwwwwwwww"**  
*\# while-loop打印九九乘法表,金字塔形状*  
r = 1  
**while** r <=  len(rows): *\#注意：同一个缩进的语句属于同一个代码段*  
c = 1  
**while** c <= r:  
**print "%s \* %s = %s\\t"**% (r, c, r \* c),  
c += 1  
r += 1  
**print**

程序输出结果：

FFFFFFFFFF for循环 FFFFFFFFFF

1 \* 1 = 1

2 \* 1 = 2 2\* 2 = 4

3 \* 1 = 3 3\* 2 = 6 3 \* 3 = 9

4 \* 1 = 4 4\* 2 = 8 4 \* 3 = 12 4 \* 4 = 16

5 \* 1 = 5 5\* 2 = 10 5 \* 3 = 15 5 \* 4 = 20 5\* 5 = 25

6 \* 1 = 6 6\* 2 = 12 6 \* 3 = 18 6 \* 4 = 24 6\* 5 = 30 6 \* 6 = 36

7 \* 1 = 7 7\* 2 = 14 7 \* 3 = 21 7 \* 4 = 28 7\* 5 = 35 7 \* 6 = 42 7 \* 7 = 49

8 \* 1 = 8 8\* 2 = 16 8 \* 3 = 24 8 \* 4 = 32 8\* 5 = 40 8 \* 6 = 48 8 \* 7 = 56 8\* 8 = 64

9 \* 1 = 9 9\* 2 = 18 9 \* 3 = 27 9 \* 4 = 36 9\* 5 = 45 9 \* 6 = 54 9 \* 7 = 63 9\* 8 = 72 9 \* 9 = 81

for循环中的continue和break使用