Question

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my for循环在每次迭代中提取一个词典列表。我试图用我在每次迭代中得到的所有列表扩展final_list。但是最后，当我打印final_list时，只是给了我上次迭代的列表。换句话说，它几乎像以前的所有列表一样被覆盖。尝试了一切，但无济于事。有人可以指出我的代码有什么问题吗？

for i in range (1,21):
    results_list = []
    final_list = []
    url = "https://api.themoviedb.org/3/discover/movie?api_key=XX&primary_release_date.gte=2000-01-01&with_genres=35&sort_by=popularity.desc&page=" + str(i)
    response = requests.get(url, timeout = 10)
    #each page is a dictionary. we get only "results" which is a list.
    #so each iteration of the loop gives us a list to work with
    results_list = response.json()['results']
    final_list.extend(results_list)
    if response.status_code != 200:
        print('Failed to get data:', response.status_code)
print(final_list)

Answer 1

您的代码中有两次result_list，一次是可以的空列表，第二次是一个对象。您不是通过以下方式更新列表：

results_list = response.json()['results']

您正在将其另存为覆盖空列表的对象。而是将每个值存储在名为“ results”的变量中，然后将其附加到列表“ results_list”

尝试以下操作：

results_list = []

for i in range (1,21):
    url = "https://api.themoviedb.org/3/discover/movie?api_key=XX&primary_release_date.gte=2000-01-01&with_genres=35&sort_by=popularity.desc&page=" + str(i)
    response = requests.get(url, timeout = 10)
    #each page is a dictionary. we get only "results" which is a list.
    #so each iteration of the loop gives us a list to work with
    results = response.json()['results']
    results_list.append(results)
    final_list.extend(results_list)
    if response.status_code != 200:
        print('Failed to get data:', response.status_code)
print(results_list)

连接或扩展覆盖到最后一个列表的字典列表

1 个答案: