# Roman numerals generator: 1 = I; 4 = IV, 20 = XX rom = {1:'I', 4:'IV', 5:'V', 9:'IX', 10:'X', 40:'XL', 50:'L', 90:'XC', 100:'C',400:'CD', 500:'D', 900:'CM', 1000:'M', 4000:'M|V ', 5000:'|V ', 9000:'|IX ', 10000:'|X '} for i in range(2, 11): if i < 4: rom[i] = i*'I' elif 5 < i < 9: rom[i] = rom[5] + (i-5)*'I' def units(y): if y < 4: unit = y*'I' elif 5 < y < 9: unit = rom[5] + (y-5)*'I' else: unit = rom[y] return unit def tens(x): if 0 <= x < 10: decs = units(x) elif 10 <= x < 40: decs = int(str(x)[0])*rom[10] + units(int(str(x)[1])) elif 40 <= x < 50: decs = rom[40] + units(int(str(x)[1])) elif 50 <= x < 90: decs = rom[50] + (int(str(x)[0])-5)*rom[10] + units(int(str(x)[1])) elif 90 <= x < 100: decs = rom[90] + units(int(str(x)[1])) return decs def hundreds(x): if 0 <= x < 100: hund = tens(x) elif 100 <= x < 400: hund = int(str(x)[0])*rom[100] + tens(int(str(x)[1] + str(x)[2])) elif 400 <= x < 500: hund = rom[400] + tens(int(str(x)[1] + str(x)[2])) elif 500 <= x < 900: hund = rom[500] + (int(str(x)[0])-5)*rom[100] + tens(int(str(x)[1] + str(x)[2])) elif 900 <= x < 1000: hund = rom[900] + tens(int(str(x)[1] + str(x)[2])) return hund def thousands(x): if 0 <= x < 1000: thou = hundreds(x) elif 1000 <= x < 4000: thou = int(str(x)[0])*rom[1000] + hundreds(int(str(x)[1] + str(x)[2] + str(x)[3])) elif 4000 <= x < 5000: thou = rom[4000] + hundreds(int(str(x)[1] + str(x)[2] + str(x)[3])) elif 5000 <= x < 9000: thou = rom[5000] + (int(str(x)[0])-5)*rom[1000] + hundreds(int(str(x)[1] + str(x)[2] + str(x)[3])) elif 9000 <= x < 10000: thou = rom[9000] + hundreds(int(str(x)[1] + str(x)[2] + str(x)[3])) return thou x = int(input('your decimal format number(max limit is 10000): \n')) if len(str(x)) == 1: roman = units(x) elif len(str(x)) == 2: roman = tens(x) elif len(str(x)) == 3: roman = hundreds(x) elif len(str(x)) == 4: roman = thousands(x) elif x == 10000: roman = rom[10000] print('{} ==> {}(Roman numerals format)'. format(x, roman))

Decimal to Roman converter