Below are the functions you'll need to write.

1.  buildMovieList

This function has one parameter:

• the filename from which to read the data

Returns a list of dictionaries, one dictionary per movie in the file. Each dictionary has three keys: 'id', 'title', and 'genres'. The 'id' key corresponds to an integer value, the 'title' key corresponds to a string title with the year in parentheses, and the 'genres' key corresponds to a list of genres for that particular movie. Here is an example of the structure of the dictionaries in the returned list:

    [ { "id": 1,

        "title": "Toy Story (1995)",

        "genres": ["Adventure", "Animation", "Children", "Comedy", "Fantasy"]

       },

      { "id": 2,

        "title": "Jumanji (1995)",

        "genres": ["Adventure", "Children", "Fantasy"]

       },

       ...

    ]

Hints: 

1. You may use the linesFromFile function from lecture that, given a filename, reads in one line per file and returns a list of strings.

2. There are 86536 movies in the movies.csv file, so your list of dictionaries returned by buildMovieList should have a length of 86536, one dictionary for each movie.

2. twoGenrePercentage

This function takes 3 parameters:

• the list of movie dictionaries

• genre1 (eg "Comedy")

• genre2 (eg "Documentary")

and returns the percentage of movies that have both genre1 and genre2 listed as genres in the entire movie list, rounded to the 2nd decimal point.

3. movieWithMostGenres

This function has one parameter:

• a list of movie dictionaries

The function prints the movie with the highest number of genres. It prints the highest number of genres and the movie title and the list of genres. If there are movies that tie for the highest number of genres, let's say there are three, your function can return any one of those three movies (it doesn't matter which one). The function only prints; it does not return a value.

4. mostPopularGenres

This function takes two parameters:

• the list of movie dictionaries

• an integer n, indicating the top n genres to print

and prints the most popular n genres, starting with the most popular genre first. 

Note: one strategy for writing mostPopularGenres is to first create a dictionary where the keys are the genres and the values are the total number of movies for each genre. After that dictionary is built, then it can be determined what the top n most popular genres are.

How to submit this homework

Make sure that your file:

• Starts with a comment indicating your name, the date, and any collaborators

• Save your python file as username_movies.py, e.g, this is how Saoirse Ronan would name her file: sr112_hw8_movies.py

• Each function has a docstring

• Each function is tested properly

• Submit your python file in gradescope