הדוגמאות הבאות של קוד Python מדגימות כיצד להשתמש ב-App Engine כדי לבצע קריאות ל-YouTube Data API (v3). אפשר להוריד את דוגמאות הקוד האלה ממאגרים לדוגמה של קוד Python ב-Google App Engine ב-GitHub.
דרישות מוקדמות
כדי שתוכלו להריץ את דוגמאות הקוד הבאות, אתם צריכים להגדיר פרויקט במסוף Google API ולקבל מפתח API. נכון לעכשיו, כל פרויקט מגדיר משתנה API_KEY
שמוגדר לערך REPLACE_ME
. כדי שתוכלו להריץ את הדוגמאות, תצטרכו להחליף את הערך הזה במפתח API משלכם.
חשוב: כדי שתוכלו להריץ את כל הדוגמאות האלה, עליכם להפעיל את YouTube Data API (v3) ואת Freebase API בפרויקט שמשויך למפתח ה-API שלכם. אם האפליקציה שלך ניגשת לנתונים של משתמשים או ערוצים פרטיים, נדרש גם מזהה לקוח מסוג OAuth 2.0.
דוגמאות קוד
חיפוש לפי מילת מפתח
דוגמת הקוד הבאה מפעילה את השיטה search.list
של ה-API כדי לאחזר תוצאות חיפוש המשויכות למילת מפתח מסוימת.
import os import urllib import webapp2 import jinja2 from apiclient.discovery import build from optparse import OptionParser JINJA_ENVIRONMENT = jinja2.Environment( loader=jinja2.FileSystemLoader(os.path.dirname(__file__)), extensions=['jinja2.ext.autoescape']) # Set DEVELOPER_KEY to the "API key" value from the Google Developers Console: # https://console.developers.google.com/project/_/apiui/credential # Please ensure that you have enabled the YouTube Data API for your project. DEVELOPER_KEY = "REPLACE_ME" YOUTUBE_API_SERVICE_NAME = "youtube" YOUTUBE_API_VERSION = "v3" class MainHandler(webapp2.RequestHandler): def get(self): if DEVELOPER_KEY == "REPLACE_ME": self.response.write("""You must set up a project and get an API key to run this project. Please visit <landing page> to do so.""" else: youtube = build( YOUTUBE_API_SERVICE_NAME, YOUTUBE_API_VERSION, developerKey=DEVELOPER_KEY) search_response = youtube.search().list( q="Hello", part="id,snippet", maxResults=5 ).execute() videos = [] channels = [] playlists = [] for search_result in search_response.get("items", []): if search_result["id"]["kind"] == "youtube#video": videos.append("%s (%s)" % (search_result["snippet"]["title"], search_result["id"]["videoId"])) elif search_result["id"]["kind"] == "youtube#channel": channels.append("%s (%s)" % (search_result["snippet"]["title"], search_result["id"]["channelId"])) elif search_result["id"]["kind"] == "youtube#playlist": playlists.append("%s (%s)" % (search_result["snippet"]["title"], search_result["id"]["playlistId"])) template_values = { 'videos': videos, 'channels': channels, 'playlists': playlists } self.response.headers['Content-type'] = 'text/plain' template = JINJA_ENVIRONMENT.get_template('index.html') self.response.write(template.render(template_values)) app = webapp2.WSGIApplication([ ('/.*', MainHandler), ], debug=True)
חיפוש לפי נושא
דוגמת הקוד הבאה מפעילה את השיטה search.list
של ה-API כדי לאחזר תוצאות חיפוש המשויכות לנושא מסוים של Freebase.
import os import urllib import webapp2 import jinja2 from apiclient.discovery import build from optparse import OptionParser import json JINJA_ENVIRONMENT = jinja2.Environment( loader=jinja2.FileSystemLoader(os.path.dirname(__file__)), extensions=['jinja2.ext.autoescape']) REGISTRATION_INSTRUCTIONS = """ You must set up a project and get an API key to run this code. Please see the instructions for creating a project and a key at <a href="https://developers.google.com/youtube/registering_an_application" >https://developers.google.com/youtube/registering_an_application</a>. <br><br> Make sure that you have enabled the YouTube Data API (v3) and the Freebase API for your project.""" # Set API_KEY to the "API key" value from the Google Developers Console: # https://console.developers.google.com/project/_/apiui/credential # Please ensure that you have enabled the YouTube Data API and Freebase API # for your project. API_KEY = "REPLACE_ME" YOUTUBE_API_SERVICE_NAME = "youtube" YOUTUBE_API_VERSION = "v3" FREEBASE_SEARCH_URL = "https://www.googleapis.com/freebase/v1/search?%s" QUERY_TERM = "dog" class MainHandler(webapp2.RequestHandler): def get(self): if API_KEY == 'REPLACE_ME': self.response.write(REGISTRATION_INSTRUCTIONS) else: # Present a list of Freebase topic IDs for the query term self.list_topics(QUERY_TERM) def list_topics(self, QUERY_TERM): # Retrieve a list of Freebase topics associated with the query term freebase_params = dict(query=QUERY_TERM, key=API_KEY) freebase_url = FREEBASE_SEARCH_URL % urllib.urlencode(freebase_params) freebase_response = json.loads(urllib.urlopen(freebase_url).read()) if len(freebase_response["result"]) == 0: exit("No matching terms were found in Freebase.") # Create a page that shows a select box listing the topics. # When the user selects a topic and submits the form, the # 'post' method below will handle the form submission and # retrieve videos for the selected topic. select_topic_page = (''' <html> <body> <p>The following topics were found:</p> <form method="post"> <select name="topic"> ''') for result in freebase_response["result"]: select_topic_page += ('<option value="' + result["mid"] + '">' + result.get("name", "Unknown") + '</option>') select_topic_page += ''' </select> <p><input type="submit" /></p> </form> </body> </html> ''' # Display the HTML page listing the topic choices. self.response.out.write(select_topic_page) def post(self): topic_id = self.request.get('topic') # Service for calling the YouTube API youtube = build(YOUTUBE_API_SERVICE_NAME, YOUTUBE_API_VERSION, developerKey=API_KEY) # Execute the search request using default query term and retrieved topic. search_response = youtube.search().list( part = 'id,snippet', type = 'video', topicId = topic_id ).execute() videos = [] for search_result in search_response.get("items", []): videos.append(search_result) template_values = { 'videos': videos } self.response.headers['Content-type'] = 'text/html' template = JINJA_ENVIRONMENT.get_template('index.html') self.response.write(template.render(template_values)) app = webapp2.WSGIApplication([ ('/.*', MainHandler), ], debug=True)
אחזור העלאות של ערוץ
דוגמת הקוד הבאה מפעילה את השיטה playlistItems.list
של ה-API כדי לאחזר רשימה של סרטונים שהועלו לערוץ שצוין. אפשר לזהות את הערוץ לפי מזהה הערוץ או לפי שם הערוץ. הקוד גם מפעיל את השיטה channels.list
כדי לאחזר את מזהה הפלייליסט שמזהה את הסרטונים שהועלו בערוץ.
import os import urllib import webapp2 import jinja2 from apiclient.discovery import build from optparse import OptionParser import json JINJA_ENVIRONMENT = jinja2.Environment( loader=jinja2.FileSystemLoader(os.path.dirname(__file__)), extensions=['jinja2.ext.autoescape']) REGISTRATION_INSTRUCTIONS = """ You must set up a project and get an API key to run this code. Please see the instructions for creating a project and a key at <a href="https://developers.google.com/youtube/registering_an_application" >https://developers.google.com/youtube/registering_an_application</a>. <br><br> Make sure that you have enabled the YouTube Data API (v3) and the Freebase API for your project.""" # Set API_KEY to the "API key" value from the Google Developers Console: # https://console.developers.google.com/project/_/apiui/credential # Please ensure that you have enabled the YouTube Data API and Freebase API # for your project. API_KEY = "REPLACE_ME" YOUTUBE_API_SERVICE_NAME = "youtube" YOUTUBE_API_VERSION = "v3" FREEBASE_SEARCH_URL = "https://www.googleapis.com/freebase/v1/search?%s" QUERY_TERM = "dog" class MainHandler(webapp2.RequestHandler): def get(self): if API_KEY == 'REPLACE_ME': self.response.write(REGISTRATION_INSTRUCTIONS) else: # Present a list of Freebase topic IDs for the query term self.request_channel() def request_channel(self): # Display a text box where the user can enter a channel name or # channel ID. select_channel_page = ''' <html> <body> <p>Which channel's videos do you want to see?</p> <form method="post"> <p> <select name="channel_type"> <option value="id">Channel ID</option> <option value="name">Channel name</option> </select> <input name="channel" size="30"> </p> <p><input type="submit" /></p> </form> </body> </html> ''' # Display the HTML page that shows the form. self.response.out.write(select_channel_page) def post(self): # Service for calling the YouTube API youtube = build(YOUTUBE_API_SERVICE_NAME, YOUTUBE_API_VERSION, developerKey=API_KEY) # Use form inputs to create request params for channel details channel_type = self.request.get('channel_type') channels_response = None if channel_type == 'id': channels_response = youtube.channels().list( id=self.request.get('channel'), part='snippet,contentDetails' ).execute() else: channels_response = youtube.channels().list( forUsername=self.request.get('channel'), part='snippet,contentDetails' ).execute() channel_name = '' videos = [] for channel in channels_response['items']: uploads_list_id = channel['contentDetails']['relatedPlaylists']['uploads'] channel_name = channel['snippet']['title'] next_page_token = '' while next_page_token is not None: playlistitems_response = youtube.playlistItems().list( playlistId=uploads_list_id, part='snippet', maxResults=50, pageToken=next_page_token ).execute() for playlist_item in playlistitems_response['items']: videos.append(playlist_item) next_page_token = playlistitems_response.get('tokenPagination', {}).get( 'nextPageToken') if len(videos) > 100: break template_values = { 'channel_name': channel_name, 'videos': videos } self.response.headers['Content-type'] = 'text/html' template = JINJA_ENVIRONMENT.get_template('index.html') self.response.write(template.render(template_values)) app = webapp2.WSGIApplication([ ('/.*', MainHandler), ], debug=True)