7. while循环

    while 条件:
        条件满足时，做的事情1
        条件满足时，做的事情2
        条件满足时，做的事情3
        ...(省略)...

    *
    * *
    * * *
    * * * *
    * * * * *

i = 1
while i <= 5:
    j = 1
    while j <= i:
        print("* ", end = '')
        j += 1

    print("\n")
    i += 1

# 九九乘法表

i = 1
while i<=9:
    j=1
    while j<=i:
        print("%d*%d=%-2d " % (j, i, i*j), end = '')
        j+=1
    print('\n')
    i+=1

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