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user_credentials: A tuple is used for user credentials to reflect their immutable nature, meaning they should not be changed by the program.
watch_history: A list is ideal for storing the movies a user has watched, as it is a mutable data type that allows for new movies to be added easily using the .append() method.
user_ratings: A dictionary is used to map each movie (as a key) to its corresponding rating (as a value). This provides an efficient way to store and retrieve a specific movie's rating.
add_movie(): This function takes a movie title and adds it to the watch_history list. It includes a check to ensure the movie is not added twice.
update_rating(): This function uses the movie title as a key to find and update its value in the user_ratings dictionary. It also checks if the movie exists in the ratings before attempting the update.
highest_rated_movie(): This function finds the movie with the highest rating.
max(user_ratings, key=user_ratings.get) is a powerful and concise way to find the key (the movie title) that corresponds to the maximum value (the rating) in the dictionary.
user_ratings.get is used as the key argument for the max() function, which tells it to compare the items based on their associated values.

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