The filter function calls a test function, which returns a Boolean, on each element of a list and includes that element only if the test function returns True.
filter函数为列表的每个元素调用一个测试函数，测试函数返回布尔值，当测试函数返回True时，还包含列表的元素。
Because not apply to advanced API, provides the test user login, can access personal information, friends list, online albums, upload pictures, download pictures of the function.
由于未申请到高级api，提供测试用户登录，可获取个人信息、好友列表、网络相册、上传图片、下载图片的功能。
Because not apply to advanced API, provides the test user login, can access personal information, friends list, online albums, upload pictures, download pictures of the function.
由于未申请到高级api，提供测试用户登录，可获取个人信息、好友列表、网络相册、上传图片、下载图片的功能。
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