python基础练习之99乘法表

while循环

a = 1         #定义初始值
while a: 
    print()    #换行
    b = 1      #定义初始值
    while b:
        m = a * b
        if b >= 10:
            break
        if b <= a:
            print(b,'*',a,'=',m,end='\t')#用制表符分割对齐打印的行
        b += 1
    a += 1
    if a >= 10:
        break

for循环

for i in range(1,10):
    for j in range(1,10):
        m = i * j
        print(j,'*',i,'=',m,end='\t')
        if i == j:
            break
    print()

for i in range(1,10):
    for j in range(1,10):
        product = i * j
        if j <= i:
#           if product < 10:
#                spaces = '  '
#           else:
#                spaces = ' '
            spaces = '   ' if product < 10 else '  '   #三元表达式，等同于上面的注释语句
            print(j,'*',i,'=',product,end=spaces)
    print()#输出换行

for i in range(1,10): 
    for j in range(1,i+1):#第二层循环可以使用第一层的i变量控制循环
        m = i * j
        print(j,'*',i,'=',m,end='\t')
    print()

for i in range(1,10):
    line = ''
    for j in range(1,i+1):
        line += '{}*{}={:<{}}'.format(i,j,i*j,2 if j == 1 else 3)
    print(line)

for i in range(1,10):
    for j in range(1,1+i):
        print('{}*{}={:<{}}'.format(i,j,i*j,2 if j == 1 else 3),end='\n' if i == j else '' )

6.

for i in range(1,10):
    print((i-1) * '\t',end='')
    for j in range(i,10):   # i <= j < 10
            print('{}*{}={}'.format(i,j,i*j),end='\n' if j == 9 else '\t') 

7.

for i in range(1,10):    #同6是一个效果
    for j in range(i,10):   # i <= j < 10
        print('{}*{}={}'.format(i,j,i*j),end='\n' + i * '\t' if j == 9 else '\t')