title: Gunicorn Import by filename is not supported (module)
body: <p>I have newly created a container ubuntu and installed the required packages in the virtual environment. Then I have executed the pre-existing python service code by python path/to/my/file/X.py (in virualenv) it's working fine. So I have executed with gunicorn as gunicorn -b 0.0.0.0:5000 path/to/my/file/X:app (in virualenv) but I'm getting the following error</p>
  
  <pre><code>2015-11-11 16:38:08 [19118] [INFO] Starting gunicorn 17.5
  2015-11-11 16:38:08 [19118] [INFO] Listening at: http://0.0.0.0:444 (19118)
  2015-11-11 16:38:08 [19118] [INFO] Using worker: sync
  2015-11-11 16:38:08 [19123] [INFO] Booting worker with pid: 19123
  2015-11-11 16:38:08 [19123] [ERROR] Exception in worker process:
  Traceback (most recent call last):
    File "/usr/lib/python2.7/dist-packages/gunicorn/arbiter.py", line 473, in spawn_worker
      worker.init_process()
    File "/usr/lib/python2.7/dist-packages/gunicorn/workers/base.py", line 100, in init_process
      self.wsgi = self.app.wsgi()
    File "/usr/lib/python2.7/dist-packages/gunicorn/app/base.py", line 115, in wsgi
      self.callable = self.load()
    File "/usr/lib/python2.7/dist-packages/gunicorn/app/wsgiapp.py", line 33, in load
      return util.import_app(self.app_uri)
    File "/usr/lib/python2.7/dist-packages/gunicorn/util.py", line 362, in import_app
      __import__(module)
  ImportError: Import by filename is not supported.
  Traceback (most recent call last):
    File "/usr/lib/python2.7/dist-packages/gunicorn/arbiter.py", line 473, in spawn_worker
      worker.init_process()
    File "/usr/lib/python2.7/dist-packages/gunicorn/workers/base.py", line 100, in init_process
      self.wsgi = self.app.wsgi()
    File "/usr/lib/python2.7/dist-packages/gunicorn/app/base.py", line 115, in wsgi
      self.callable = self.load()
    File "/usr/lib/python2.7/dist-packages/gunicorn/app/wsgiapp.py", line 33, in load
      return util.import_app(self.app_uri)
    File "/usr/lib/python2.7/dist-packages/gunicorn/util.py", line 362, in import_app
      __import__(module)
  ImportError: Import by filename is not supported.
  2015-11-11 16:38:08 [19123] [INFO] Worker exiting (pid: 19123)
  2015-11-11 16:38:09 [19118] [INFO] Shutting down: Master
  </code></pre>
  
  <p>Can anyone help me fix the <code>ImportError: Import by filename is not supported</code>. Why it is coming? I have implemented gunicorn in other server, it is working fine there.</p>