反转数字

def func(num):
    i=0
    new_num=0
    num_copy=num
    while num_copy>0:
        num_copy=num_copy//10
        i+=1
    while num>0:
        new_num+=10**(i-1)*(num%10)
        num=num//10
        i-=1
    return new_num

print(func(983839))