title: Using OpenWeatherMap API gives 401 error
body: <p>I'm trying to get the weather data for London in JSON but I am getting <code>HTTPError: HTTP Error 401: Unauthorized</code>.  How do I get the API working?</p>
  
  <pre><code>import urllib2
  url = "http://api.openweathermap.org/data/2.5/forecast/daily?q=London&amp;cnt=10&amp;mode=json&amp;units=metric"
  response = urllib2.urlopen(url).read()
  </code></pre>