code: def generate_requirements(output_path=None):
      
      from django.conf import settings
      reqs = set()
      
      for app in settings.INSTALLED_APPS:
          if app in mapping.keys():
              reqs |= set(mapping[app])
      if output_path is None:
          print "--extra-index-url=http://opensource.washingtontimes.com/pypi/simple/"
          for item in reqs:
              print item
      else:
          try:
              out_file = open(output_path, 'w')
              out_file.write("--extra-index-url=http://opensource.washingtontimes.com/pypi/simple/\n")
              for item in reqs:
                  out_file.write("%s\n" % item)
          finally:
              out_file.close()
docs: Loop through the INSTALLED_APPS and create a set of requirements for pip.
      
      if output_path is ``None`` then write to standard out, otherwise write
      to the path.