title: django python manage.py runserver RuntimeError: Settings already configured
body: <p>I am quite new to Django and Python. My environ is Win7 and Python3.4. Now following the tutorial in Django Official Website to build a web app. At first, everything works quite well and output are all expected and correct. But today when I re-run the command "python manage.py runserver", it gives me very strange err message as follows. Help please, many thanks! </p>
  
  <pre><code>$ python manage.py runserver 
  Traceback (most recent call last):
    File "manage.py", line 10, in &lt;module&gt;
      execute_from_command_line(sys.argv)
    File "C:\Python34\lib\site-packages\django\core\management\__init__.py", line 338, in execute_from_command_line
      utility.execute()
    File "C:\Python34\lib\site-packages\django\core\management\__init__.py", line 312, in execute
      django.setup()
    File "C:\Python34\lib\site-packages\django\__init__.py", line 18, in setup
      apps.populate(settings.INSTALLED_APPS)
    File "C:\Python34\lib\site-packages\django\apps\registry.py", line 115, in populate
      app_config.ready()
    File "C:\Python34\lib\site-packages\django\contrib\admin\apps.py", line 22, in ready
      self.module.autodiscover()
    File "C:\Python34\lib\site-packages\django\contrib\admin\__init__.py", line 24, in autodiscover
      autodiscover_modules('admin', register_to=site)
    File "C:\Python34\lib\site-packages\django\utils\module_loading.py", line 74, in autodiscover_modules
      import_module('%s.%s' % (app_config.name, module_to_search))
    File "C:\Python34\lib\importlib\__init__.py", line 109, in import_module
      return _bootstrap._gcd_import(name[level:], package, level)
    File "&lt;frozen importlib._bootstrap&gt;", line 2254, in _gcd_import
    File "&lt;frozen importlib._bootstrap&gt;", line 2237, in _find_and_load
    File "&lt;frozen importlib._bootstrap&gt;", line 2226, in _find_and_load_unlocked
    File "&lt;frozen importlib._bootstrap&gt;", line 1200, in _load_unlocked
    File "&lt;frozen importlib._bootstrap&gt;", line 1129, in _exec
    File "&lt;frozen importlib._bootstrap&gt;", line 1471, in exec_module
    File "&lt;frozen importlib._bootstrap&gt;", line 321, in _call_with_frames_removed
    File "D:\360\My Cloud\5 Software\26 Eclipse\1 Python\1TDD_Django\tdd_django\mysite\polls\admin.py", line 34, in &lt;module&gt;
      settings.configure()
    File "C:\Python34\lib\site-packages\django\conf\__init__.py", line 58, in configure
      raise RuntimeError('Settings already configured.')
  RuntimeError: Settings already configured.
  </code></pre>