title: Heroku R10 error in Python app
body: <p>I'm having a problem running my Python app in Heroku. My app scrapes a website for weather data and performs a few calculations on it. Pulling the data doesn't take more than a few seconds. When I open my app, my logs show the output of my app, but my app page continues loading until I get an R10 error, then the app page crashes. I can run my app using a one-off dyno from the command line just fine. Here are my logs:</p>
  
  <pre><code>    2016-08-18T13:58:34.073915+00:00 heroku[web.1]: Starting process with command `python WebScraper.py`
      2016-08-18T13:58:40.982330+00:00 app[web.1]: http://170.94.200.136/weather/Inversion.aspx
      2016-08-18T13:58:41.005187+00:00 app[web.1]:           Station  Low Temp (F) Time of Low  Current Temp (F) Current Time  \
      2016-08-18T13:58:41.005202+00:00 app[web.1]: 0               0.0         0           74.3      8:49 AM  
      2016-08-18T13:58:41.005205+00:00 app[web.1]: Arkansas: no inversion and spray OK
      2016-08-18T13:59:34.319236+00:00 heroku[web.1]: Error R10 (Boot timeout) -&gt; Web process failed to bind to $PORT within 60 seconds of launch
      2016-08-18T13:59:34.319458+00:00 heroku[web.1]: Stopping process with SIGKILL
      2016-08-18T13:59:34.443283+00:00 heroku[web.1]: Process exited with status 137
      2016-08-18T13:59:34.459932+00:00 heroku[web.1]: State changed from starting to crashed
      2016-08-18T13:59:34.460745+00:00 heroku[web.1]: State changed from crashed to starting
      2016-08-18T13:59:39.598773+00:00 heroku[web.1]: Starting process with command `python WebScraper.py`
      2016-08-18T13:59:46.087192+00:00 app[web.1]: http://170.94.200.136/weather/Inversion.aspx
      2016-08-18T13:59:46.099928+00:00 app[web.1]:           Station  Low Temp (F) Time of Low  Current Temp (F) Current Time  \
      2016-08-18T13:59:46.100543+00:00 app[web.1]: Ashley: strong inversion and no spray suggested
      2016-08-18T14:00:07.473438+00:00 heroku[router]: at=error code=H20 desc="App boot timeout" method=GET path="/" host=temperature-inversion.herokuapp.com request_id=c477a7b2-d755-475a-ad11-f857764386b6 fwd="199.133.80.68" dyno= connect= service= status=503 bytes=
      2016-08-18T14:00:39.933670+00:00 heroku[web.1]: Error R10 (Boot timeout) -&gt; Web process failed to bind to $PORT within 60 seconds of launch
      2016-08-18T14:00:39.933712+00:00 heroku[web.1]: Stopping process with SIGKILL
      2016-08-18T14:00:40.095100+00:00 heroku[web.1]: State changed from starting to crashed
      2016-08-18T14:00:40.079022+00:00 heroku[web.1]: Process exited with status 137
      2016-08-18T14:00:42.882673+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=temperature-inversion.herokuapp.com request_id=c5ee4daf-9825-4c53-8f9c-852b9a3eaae2 fwd="199.133.80.68" dyno= connect= service= status=503 bytes=
      2016-08-18T14:00:44.549938+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=temperature-inversion.herokuapp.com request_id=f45183be-4b77-429e-91be-dfcf832ec3ca fwd="199.133.80.68" dyno= connect= service= status=503 bytes=
  </code></pre>