Os exemplos de código Python a seguir demonstram como usar o App Engine para fazer chamadas da API YouTube Data (v3). Você pode fazer o download desses exemplos de código nos repositórios de amostras de código Python do Google App Engine no GitHub.
Pré-requisitos
É necessário configurar um projeto no Console de APIs do Google e obter uma chave de API para executar os exemplos de código abaixo. Atualmente, cada projeto define uma variável API_KEY
que é configurada como o valor REPLACE_ME
. É necessário substituir esse valor pela sua própria chave de API para executar as amostras.
Importante:para executar todos esses exemplos, é necessário ativar a API YouTube Data (v3) e a API Freebase para o projeto associado à sua chave de API. Se seu aplicativo acessa dados privados do usuário ou do canal, você também precisa de um ID do cliente OAuth 2.0.
Exemplos de código
Pesquisar por palavra-chave
O exemplo de código abaixo chama o método search.list
da API para recuperar resultados da pesquisa associados a uma palavra-chave específica.
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)
Pesquisar por tópico
O exemplo de código abaixo chama o método search.list
da API para recuperar resultados da pesquisa associados a um determinado tópico do 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)
Recuperar envios de um canal
O exemplo de código abaixo chama o método playlistItems.list
da API para recuperar uma lista de vídeos enviados a um canal especificado. O canal pode ser identificado pelo ID ou nome do canal. O código também chama o método channels.list
para recuperar o ID da playlist que identifica os vídeos enviados do canal.
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)