fileoperation.py

while True:
   print "1. Login"
   print "2. Register"
   print "3. View User"
   opsi=input("pilih Opsi [1,2,3]:")
   if opsi==1:
      username=raw_input("username:")
      password=raw_input("password:")
      try:
         a=open("username.txt").readlines()
         b=open("password.txt").readlines()
         if a.index(username+"/n") == b.index(password+"/n"):
            print "welcome", username
         else:
            print "user tidak ditemukan"
      except IOError:
         print "belum ada user"

   elif opsi==2:
      username=raw_input("username:")
      password=raw_input("password:")
      try:
         a=open("username.txt",'a')
         a.write(username+"/n")
         a.close()
         b=open("password.txt","a")
         b.write(password+"/n")
         b.close()
      except IOError:
         a=open("username.txt",'w')
         a.write(username+"/n")
         a.close()
         b=open("password.txt","w")
         b.write(password+"/n")
         b.close()

   elif opsi==3:
      up=0
      a=open("username.txt").readlines()
      b=open("password.txt").readlines()
      for i in a:
         print "[{username:",i," Password:",b.index[up+1],"}]"