python写的乘法表但是只能输出1*1不知道哪里出了问题

i = 1
j = 1
instr = " "
while i <= 9:
    while j <= 9:
        instr = instr + str(i) + "*" + str(j) + "=" + str(i*j)
        if j == i:
            print(instr)
            break
            j = j + 1
    i = i + 1

修改后如下

 
i = 1
while i <= 9:
    j = 1
    instr = " "
    while j <= 9:
        instr = instr + str(i) + "*" + str(j) + "=" + str(i*j)+' '
        if j == i:
            print(instr)
            break
        j = j + 1
    i = i + 1

break位置写错了，j变化了以后再break