Write a Python program to convert a roman numeral to an integer.

Roman_Number_converter.py

class A:
    def convert(self,roman):
        num_list=[1,4,5,9,10,40,50,90,100,400,500,900,1000]
        rom_list=['I','IV','V','IX','X','XL','L','XC','C','CD','D','CM','M']
        next_val= 0        
        for i in range(len(roman)):
            if i!=len(roman)-1:
                if rom_list.index(roman[i])>=rom_list.index(roman[i+1]):
                    next_val+=num_list[rom_list.index(roman[i])]
                else:
                    next_val-=num_list[rom_list.index(roman[i])]
            else:next_val+=num_list[rom_list.index(roman[i])]
                
            
        print(next_val)        
listo=['MCMXCVI','XXXVI','MMMMCMXCIX','MMMMMMDCCLXXVII']
for i in listo:
    
    A().convert(i)