Zoisite-Luwam and Jasmin #60
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| assert watch_movie not in updated_data["watched"] | ||
| assert watch_movie not in updated_data["watchlist"] |
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These asserts aren't doing what you expect. What does the variable watch_movie point to? These lines confirm that watch_movie is not in either the watched or watchlist lists, is that what's intended?
| @@ -158,13 +160,15 @@ def test_moves_movie_from_watchlist_to_empty_watched(): | |||
| # Assert | |||
| assert len(updated_data["watchlist"]) == 0 | |||
| assert len(updated_data["watched"]) == 1 | |||
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| raise Exception("Test needs to be completed.") | |||
| assert watch_movie not in updated_data["watched"] | |||
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Best practices are to keep a single space on either side of operators like in and not in
| assert movie_to_watch in updated_data["watched"] | ||
| assert movie_to_watch not in updated_data["watchlist"] |
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Something to think about for test assertions, checking that the movie we want has moved lists doesn't guarantee that there were no unexpected changes to any other pieces of data. It can be helpful to confirm all movies are where we expect them:
assert movie_to_watch in updated_data["watched"]
assert FANTASY_2 in updated_data["watched"]
assert FANTASY_1 in updated_data["watchlist"]| assert INTRIGUE_3 in friends_unique_movies | ||
| assert HORROR_1 in friends_unique_movies | ||
| assert FANTASY_4 in friends_unique_movies |
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Great checks for all the relevant movies!
| movies = title, genre, rating | ||
| if all(movies): | ||
| return {"title": title, "genre": genre, "rating": rating} | ||
| else: | ||
| return None |
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This is a neat use of all! For this solution, we create a tuple, then iterate through it with all. If we were in a low memory environment and had to reduce variables used, we could use the parameter's truthy/falsy values to create a validation check:
if not (title and genre and rating):
return None
return {"title": title, "genre": genre, "rating": rating}By flipping the order, we also get to un-nest the intended path of our code.
| break | ||
| if not already_added: | ||
| unique_watched.append(movie) | ||
| return unique_watched |
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Great approach with nested loops! Another of many possible implementations could use the Set data structure to solve this – if we used a Set to hold the titles of the movies in our friends' watched lists, we can then make a single loop over the user’s watched list to generate the unique movies list:
friend_movie_titles = set()
for friend in user_data["friends"]:
for movie in friend["watched"]:
friend_movie_titles.add(movie["title"])
unique_watched = []
for movie in user_data["watched"]:
if movie["title"] not in friend_movie_titles:
unique_watched.append(movie)
return unique_watched| # ----------------------------------------- | ||
| # ------------- WAVE 4 -------------------- | ||
| # ----------------------------------------- | ||
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| def get_available_recs(user_data): | ||
| recommended_movie =[] | ||
| friends_unique_movies = get_friends_unique_watched(user_data) |
| watched_genres = {} | ||
| for movie in user_data["watched"]: | ||
| genre = movie["genre"] | ||
| if genre in watched_genres: | ||
| watched_genres[genre] += 1 | ||
| else: | ||
| watched_genres[genre] = 1 | ||
| if len(watched_genres) == 0: | ||
| return [] | ||
| most_frequent_genre = max(watched_genres, key=watched_genres.get) |
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Great use of a frequency map & max! Could we reuse our function get_most_watched_genre to help reduce what we need to write here?
| recommended_movies = [] | ||
| for friend in user_data["friends"]: | ||
| for movie in friend["watched"]: | ||
| if movie["genre"] == most_frequent_genre and movie not in recommended_movies and movie not in user_data["watched"]: |
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Nice conditionals to check what we need! To keep our lines under the best practice of 79 characters, we should split this over a few lines:
if movie["genre"] == most_frequent_genre
and movie not in recommended_movies
and movie not in user_data["watched"]:
recommended_movies.append(movie)| for friend in user_data["friends"]: | ||
| if movie in friend["watched"]: | ||
| has_watched = True | ||
| break |
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Love the break to exit the loop as soon as we know we don't want to add the movie to the recommendations!
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