I just started my gcse computer science course where we learn python. I need help with updating a user's score to a certain account. I am storing usernames passwords and scores in a text file and need to know how to change a score from a certain account. My text file is set out like this:

```
Bobby,pass,98
Pip,Noob,19
pog,man,1234

```

E.g Bobby is the username and pass is the password and 98 is the score so what I need is a way to scan for that certain username and change the score (98).
The code that I use for creating an account and logging in is this:

```

def SignUp():
    print("""Please enter a username and password.""")
    newUsername = input("Your username: ")
    #Now askes for a password
    print("""Cool now enter a password
    """)

    newPassword = input("Your Password: ")
    print("Nice.")
    newscore = input("Now give me a score")
    #Puts the username and password into a txt
    file = open("Login.txt","a")
    file.write("""
""")
    file.write (newUsername)
    file.write (",")
    file.write (newPassword)
    file.write (",")
    file.write (newscore)
    file.close()

def Login():
    userLogin = input("Please enter your username. ")
    userPass = input("Password: ")

    logged_in = False
    with open('Login.txt', 'r') as file:
        for line in file:
            username, password, score = line.split(',')
            if username == userLogin:
            # Check the username against the one supplied
                logged_in = password == userPass
                print(str(score))
                print("you logged in")
                break

SignUp()
Login()

```

I'm quite new to python as you can probably tell so any help will be appreciated.