Python填空谢谢谢谢

a = [1,5,7,3,2,4,9,10,6,8]
b = [a[0]]

for num in a[1:]:
    for i in range(len(b)):
        if b[i] !=  num:
            b.insert(i,num)
            break
    else:
        b.append(num)

print(b)