Python中的for循环、while循环示例

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print "\nFFFFFFFFFFfor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 inrange(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

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wwwwwwww python中的while循环 wwwwwwwwww