python - 如何在字典中查找共享相同键的值？

Question

我希望输入为 actorsInCommon(movies, "Moneyball", "Oceans Eleven")

我希望输出为 ["Brad Pitt", "Joe Smith"]

movies = {"Moneyball": ["Brad Pitt", "Jonah Hill", "Joe Smith"], 
          "Oceans Eleven": ["Brad Pitt", "Joe Smith", "George Clooney"]}

def find(key, dictionary):
    for (k, value) in dictionary:
        if key == k:
            return value
    return None

def actorsInCommon(dictionary, movie1, movie2):
    movie1Cast = find(movie1, dictionary)
    movie2Cast = find(movie2, dictionary)
    return list(set(movie1Cast).intersection(movie2Cast))

Answer 1

movies = {"Moneyball": ["Brad Pitt", "Jonah Hill", "Joe Smith"], 
          "Oceans Eleven": ["Brad Pitt", "Joe Smith", "George Clooney"]}

从两个字典中的值中获取创建的两个集合的交集。使用默认为空列表的 get()(如果使用，将转换为一个集合)用于缺少电影名称。转换为列表以匹配所需的输出:

def actorsInCommon(dictionary, movie1, movie2):
    return list(set(dictionary.get(movie1, [])) & set(dictionary.get(movie2, [])))

>>> actorsInCommon(movies, "Moneyball", "Oceans Eleven")
['Brad Pitt', 'Joe Smith']