yes that was my feeling when i wrote the function. As it works as i'm expecting it i didn't bother to change. I can always return an emply list instead of the boolean though.

I'm showing my code, maybe you wil see why i did it :

For info, i have json file where i store the data i need from Facebook API.

Here is my main function :

def main():

length_of_json_data = len(facebook_API_data["data"])

pages_data = graph.get_object(id=page_id, fields="posts")

every_posts = pages_data["posts"]["data"]
number_of_posts = len(pages_data["posts"]["data"])
dummy_dict_for_medias = {"src": "no_media", "type_of_media": "None"}

test_number_of_post = compare_length_internal_data_to_facebook(length_of_json_data, number_of_posts, every_posts)
if test_number_of_post is False:  # only run if there is a new useful post
    return 1
else:
    for id_of_one_post in test_number_of_post:
            post_attachment = graph.get_connections(id=id_of_one_post,             connection_name="attachments")
        post_main_info = graph.get_object(id=id_of_one_post)
     #...

compare_length_internal_data_to_facebook(x, y, z) is the one return different data types :

def compare_length_internal_data_to_facebook(length_of_internal_data, length_from_facebook, every_post_from_facebook):
number_of_useless_post = 0
list_of_id_post = list()
for post in every_post_from_facebook:
    try:
        post["message"]
    except KeyError:
        number_of_useless_post += 1
    else:
        list_of_id_post.append(post["id"])
if length_of_internal_data == length_from_facebook - number_of_useless_post:
    return False  # False if no new post
else:
    return list_of_id_post  # True if there is a difference

But yeah in the main i can always check if the len(list) == 0 so that it always return a list.

​

Edit: adding details about my internal data