old_contents: # coding=utf-8
  
  import views
  from rest_framework import routers
  
  
  api_router = routers.DefaultRouter()
  api_router.register(r'pm25/(?P<city>\w+)/lastest', views.AirConditionViewSets, base_name='pm25')
  api_router.register(r'pm25-avg/(?P<city>\w+)/lastest', views.AirAverageViewSets, base_name='pm25-avg')
  
new_contents: # coding=utf-8
  
  from rest_framework import routers
  
  from . import views
  
  
  api_router = routers.DefaultRouter()
  api_router.register(r'pm25/(?P<city>\w+)/lastest', views.AirConditionViewSets, base_name='pm25')
  api_router.register(r'pm25-avg/(?P<city>\w+)/lastest', views.AirAverageViewSets, base_name='pm25-avg')
  
subject: Fix python3 ImportError