写法一
#!/usr/bin/env python3
for i in range(1, 10):
for j in range(1, i+1):
print('%sX%s=%s' % (i, j, i*j), end=' ')
print()
写法二
#!/usr/bin/env python3
i=1
while i<=9:
j=1
while j<=i:
print("%d*%d=%d" % (j, i, j*i), end=' ')
j+=1
print("")
i+=1