Generador de números romanos

base_num={1:"I",2:"II",3:"III",4:"IV",5:"V",
          6:"VI",7:"VII",8:"VIII",9:"IX",

          10:"X",20:"XX",30:"XXX",40:"XL",50:"L",60:"LX",
          70:"LXX",80:"LXXX",90:"XC",

          100:"C",200:"CC",300:"CCC",400:"CD",500:"D",
          600:"DC",700:"DCC",800:"DCCC",900:"CM",

          1000:"M",2000:"MM",3000:"MMM",4000:"IV",5000:"V",
          6000:"VI",7000:"VII",8000:"VIII",9000:"IX",

          10000:"X"}

print("*Generador de # Romanos [1 - 10.000]*")
while True:
    try:
        num=int(input("Ingrese número: "))
        if num>0 and num<=10000:break
        else:print("Fuera de rango.")
    except ValueError:print("Dato incorrecto.")

gen_num=[]

if(num in base_num):##valores del diccionario
    gen_num.append(base_num[num])

else:
    num=list(str(num))
    for i in range(len(num),0,-1):
        if(num[0]=="0"):
            num.pop(0)
        else:
            gen_num.append(base_num[int(num[0])*int(str("1"+"0"*(i-1)))])
            num.pop(0)

print("Equivalente: "+str("".join(gen_num)))