Convert numbers to roman numbers using a class instances

Roman Number Coversion

class A:
    def __init__(self,num):
        self.num=num
        self.num_list=[1,4,5,9,10,40,50,90,100,400,500,900,1000]
        self.rom_list=['I','IV','V','IX','X','XL','L','XC','C','CD','D','CM','M']
        self.roman_num=" "
        self.next_val= num
    def convert(self,num):
        while self.next_val!=0:
            if self.next_val<1000:
                for i  in range(len(self.num_list)):
                    if self.next_val<self.num_list[i] and self.next_val>=self.num_list[i-1]:
                        self.next_val=self.next_val-self.num_list[i-1]
                        self.roman_num=self.roman_num+(self.rom_list[i-1])
            else:
                self.roman_num=self.roman_num+(self.next_val//1000)*'M'
                self.next_val=self.next_val-(self.next_val//1000)*1000
        print(self.roman_num)
numbers=[1996,2012,6512,57,66]
for i in numbers:
    deneme=A(i)
    deneme.convert(i)