Program Kalkulator Sederhana Pada Python

loop = 1
pil=0

while loop == 1 :
        print ""
        print ""
        print ""
        print "Selamat Datang Di Program Kalkulator"
        print ""
        print "1) Penjumlahan"
        print "2) Pengurangan"
        print "3) Perkalian"
        print "4) Pembagian"
        print "5) Keluar"
        print ""
       
        pil = input("Masukkan Pilihan Anda : ")
        print ""
       
        if pil == 1:
                jumlah1 = input("Nilai 1 = ")
                jumlah2 = input("Nilai 2 = ")
                print jumlah1, " + ", jumlah2," = ",jumlah1+jumlah2
   
        elif pil == 2 :
                Kurang1 = input("Nilai 1 = ")
                Kurang2 = input("Nilai 2 = ")
                print Kurang1, " - ", Kurang2," = ",Kurang1-Kurang2

        elif pil == 3 :
                Kali1 = input("Nilai 1 = ")
                Kali2 = input("Nilai 2 = ")
                print Kali1, " * ", Kali2," = ",Kali1*Kali2


        elif pil == 4 :
                Bagi1 = input("Nilai 1 = ")
                Bagi2 = input("Nilai 2 = ")
                print Bagi1, " : ", Bagi2," = ",Bagi1/Bagi2

        else :
                quit()

ingat ya.. posisinya harus persis kaya gini, dan hurufnya juga harus sama persis supaya programnya jalannya lancar.. :D