users = {
    "amir": "123456",
    "ashkan": "12345678",
    "reza": "123"
}


# new_name = 0
enterd_username = 0
y = "y"                     # for line 26

while enterd_username not in  users:                   #i serch this one 
 
    enterd_username = input("enter your username : ")


    if enterd_username in users:
        print("you are a user")
        v = True
    else:
        print("you are not a user sign up first.")
        v = False 
        if v == False :
            new_user = input("are you wana sign up ? y/n :")
            if new_user == y :
                new_name = input("write your username : ")
                while new_name in users :
                    new_name = input("This name has been used before \n try a new one : ")
                new_password = input("write your password : ")
                new_password2 = input("write your password again : ")
                while new_password != new_password2 : 
                    new_password = input("password doesn't match try again \n write your password : ")
                    new_password2 = input("write your password again : ")
                if new_password == new_password :
                    str(new_password)
                    str(new_name)
                    users.update({new_name : new_password})
                    print("you sign up successfully")
            else :
                print("sorry, you can't use website without having account")
                break    
        

if  v == True :
    enterd_password = input("enter your password : ")
    
    x = enterd_username
    p = enterd_password == users[x]

    while p != True:
        print("your password was wrong ")
        enterd_password = input("try again : ")
        p = enterd_password == users[x]

    if p == True:
        print("you loged in successfully")
        print("WELCOME")