SQLite3: Find a user based on their ID using a function

Question

I want to make a function:

def UserGameDetails(UserID):

SQL = '''SELECT U.FirstName, U.LastName, COUNT(*) AS TotalGames
         FROM User U INNER JOIN Game G
         ON U.Id = G.UserId
         WHERE U.Id = ? '''

As you can see, the function can be called by writing for example: UserGameDetails(3), and you will recieve all relevant information for the user with ID 3.

How can I make it so that my function knows that what the user puts in the brackets, is the UserID it is looking for?