title: Filter images from tweets
body: <p>I am fresh to tweepy, and I wandering how is it possible to track down and store the image that a user posts in his/her tweets. I found several ways in tutorials to get user tweets, but I couldnt find a way to filter only the images.</p>
  
  <p>I am using the following code in order to get user tweets. How is it possible to get only user images??</p>
  
  <p>EDIT: I edit my code like above:</p>
  
  <pre><code>auth = tweepy.OAuthHandler(CONSUMER_KEY, CONSUMER_SECRET)
  auth.set_access_token(OAUTH_TOKEN, OAUTH_SECRET)
  api = tweepy.API(auth)
  timeline = api.user_timeline(count=10, screen_name = "zenitiss") 
  for tweet in timeline: 
     for media in tweet.entities.get("media",[{}]):
        print media
        #checks if there is any media-entity
        if media.get("type",None) == "photo":
            # checks if the entity is of the type "photo"
            image_content=requests.get(media["media_url"])
            print image_content
  </code></pre>
  
  <p>However it seems that the for loop it doesnt works. The print media line prints a null object. Basically when I am trying to print urls of a user for example karyperry I am getting:</p>
  
  <pre><code>{u'url': u'http://t.co/TaP2JZrpxu', u'indices': [42, 64], u'expanded_url':  
  u'http://youtu.be/7bDLIV96LD4', u'display_url': u'youtu.be/7bDLIV96LD4'}
  {u'url': u'https://t.co/t3hv7VQiPG', u'indices': [42, 65], u'expanded_url': 
  u'https://vine.co/v/MgvxZA2qKbV', u'display_url': u'vine.co/v/MgvxZA2qKbV'}
  {u'url': u'http://t.co/vnJAAU7KN6', u'indices': [50, 72], u'expanded_url':
  u'http://instagram.com/p/n01XZjv-fp/', u'display_url': u'instagram.com/p/n01XZjv-fp/'}
  {u'url': u'http://t.co/NycqAwtcgo', u'indices': [78, 100], u'expanded_url':
  u'http://bit.ly/1o7xQRj', u'display_url': u'bit.ly/1o7xQRj'}
  {u'url': u'http://t.co/BG6ozuRD6D', u'indices': [111, 133], u'expanded_url':
  u'http://www.johnnywujek.com/sos', u'display_url': u'johnnywujek.com/sos'}
  {u'url': u'http://t.co/nWIQ9ruJ3f', u'indices': [88, 110], u'expanded_url':
  u'http://uncf.us/1kSXIwF', u'display_url': u'uncf.us/1kSXIwF'}
  {u'url': u'http://t.co/yTbOgqt9fw', u'indices': [101, 123], u'expanded_url':
  u'http://instagram.com/p/nvxD8eP-SZ/', u'display_url': u'instagram.com/p/nvxD8eP-SZ/'}
  </code></pre>
  
  <p>The most of urls are images, however when I put 'url' instead of 'media' in loop for media in tweet.entities.get("url",[{}]). Most of them are image urls.</p>