App Engine Kod Örneklerinde Python

Aşağıdaki Python kod örnekleri, YouTube Data API (v3) çağrıları yapmak için App Engine'in nasıl kullanılacağını gösterir. Bu kod örneklerini GitHub'daki Google App Engine Python kod örneği depolarından indirebilirsiniz.

Ön koşullar

Aşağıdaki kod örneklerini çalıştırabilmek için Google API Konsolu'nda bir proje oluşturmanız ve bir API anahtarı almanız gerekir. Şu anda her proje REPLACE_ME değerine ayarlanmış bir API_KEY değişkeni tanımlamaktadır. Örnekleri çalıştırabilmek için bu değeri kendi API anahtarınızla değiştirmeniz gerekir.

Önemli: Bu örneklerin tümünü çalıştırabilmek için API anahtarınızla ilişkili proje için YouTube Data API'yi (v3) ve Freebase API'yi etkinleştirmeniz gerekir. Uygulamanız gizli kullanıcı veya kanal verilerine erişiyorsa OAuth 2.0 istemci kimliğine de ihtiyacınız olacaktır.

Kod örnekleri

Anahtar kelimeye göre ara

Aşağıdaki kod örneği, belirli bir anahtar kelimeyle ilişkili arama sonuçlarını almak için API'nin search.list yöntemini çağırır.

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)

Konuya göre ara

Aşağıdaki kod örneği, belirli bir Freebase konusuyla ilişkili arama sonuçlarını almak için API'nin search.list yöntemini çağırır.

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)

Bir kanalın yüklemelerini al

Aşağıdaki kod örneği, belirli bir kanala yüklenen videoların listesini almak için API'nin playlistItems.list yöntemini çağırır. Kanal, kanal kimliği veya kanal adıyla tanımlanabilir. Kod, kanalın yüklediği videoları tanımlayan oynatma listesi kimliğini almak için channels.list yöntemini de çağırır.

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)