print ("enter your name, age, and year group and password")
while True:
    reg_name = str(input("Name:"))
    reg_pass = input ("Password:")
    reg_age = input ("age:")
    reg_group = input ("Year Group")
    print (" Is this infomation correct?")
    print ("Name:",reg_name)
    print ("password:",reg_pass)
    print ("Age:",reg_age)
    print ("Year Group:", reg_group)
    reg_correct = input ("[Y/N]").lower()
    if reg_correct == "y":
        reg_user = reg_name[0:3]+reg_age
        reg_write = open("D:\Computer science\Computing test\logindata.txt","a")
        reg_write.write (reg_user+","+reg_name+","+reg_pass+","+reg_age+","+reg_group+"/r/n")
        print ("Your username is:",reg_user)
        reg_write.close()
        break
    elif reg_correct == "n":
        print ("Please Re-enter your infomation")
    else:
        Print ("Invalid input! Please try again...!")