old_contents: # Webhooks for external integrations.
  
  from typing import Any, Dict, Text
  
  import ujson
  from django.http import HttpRequest, HttpResponse
  
  from zerver.decorator import api_key_only_webhook_view
  from zerver.lib.actions import check_send_stream_message
  from zerver.lib.request import REQ, has_request_variables
  from zerver.lib.response import json_error, json_success
  from zerver.models import UserProfile
  
  CIRCLECI_SUBJECT_TEMPLATE = u'{repository_name}'
  CIRCLECI_MESSAGE_TEMPLATE = u'[Build]({build_url}) triggered by {username} on {branch} branch {status}.'
  
  FAILED_STATUS = 'failed'
  
  @api_key_only_webhook_view('CircleCI')
  @has_request_variables
  def api_circleci_webhook(request, user_profile, payload=REQ(argument_type='body'),
                           stream=REQ(default='circleci')):
      # type: (HttpRequest, UserProfile, Dict[str, Any], Text) -> HttpResponse
      payload = payload['payload']
      subject = get_subject(payload)
      body = get_body(payload)
  
      check_send_stream_message(user_profile, request.client, stream, subject, body)
      return json_success()
  
  def get_subject(payload: Dict[str, Any]) -> Text:
      return CIRCLECI_SUBJECT_TEMPLATE.format(repository_name=payload['reponame'])
  
  def get_body(payload: Dict[str, Any]) -> Text:
      data = {
          'build_url': payload['build_url'],
          'username': payload['username'],
          'branch': payload['branch'],
          'status': get_status(payload)
      }
      return CIRCLECI_MESSAGE_TEMPLATE.format(**data)
  
  def get_status(payload: Dict[str, Any]) -> Text:
      status = payload['status']
      if payload['previous'] and payload['previous']['status'] == FAILED_STATUS and status == FAILED_STATUS:
          return u'is still failing'
      if status == 'success':
          return u'succeeded'
      return status
  
new_contents: # Webhooks for external integrations.
  
  from typing import Any, Dict, Text
  
  import ujson
  from django.http import HttpRequest, HttpResponse
  
  from zerver.decorator import api_key_only_webhook_view
  from zerver.lib.actions import check_send_stream_message
  from zerver.lib.request import REQ, has_request_variables
  from zerver.lib.response import json_error, json_success
  from zerver.models import UserProfile
  
  CIRCLECI_SUBJECT_TEMPLATE = u'{repository_name}'
  CIRCLECI_MESSAGE_TEMPLATE = u'[Build]({build_url}) triggered by {username} on {branch} branch {status}.'
  
  FAILED_STATUS = 'failed'
  
  @api_key_only_webhook_view('CircleCI')
  @has_request_variables
  def api_circleci_webhook(request: HttpRequest, user_profile: UserProfile,
                           payload: Dict[str, Any]=REQ(argument_type='body'),
                           stream: Text=REQ(default='circleci')) -> HttpResponse:
      payload = payload['payload']
      subject = get_subject(payload)
      body = get_body(payload)
  
      check_send_stream_message(user_profile, request.client, stream, subject, body)
      return json_success()
  
  def get_subject(payload: Dict[str, Any]) -> Text:
      return CIRCLECI_SUBJECT_TEMPLATE.format(repository_name=payload['reponame'])
  
  def get_body(payload: Dict[str, Any]) -> Text:
      data = {
          'build_url': payload['build_url'],
          'username': payload['username'],
          'branch': payload['branch'],
          'status': get_status(payload)
      }
      return CIRCLECI_MESSAGE_TEMPLATE.format(**data)
  
  def get_status(payload: Dict[str, Any]) -> Text:
      status = payload['status']
      if payload['previous'] and payload['previous']['status'] == FAILED_STATUS and status == FAILED_STATUS:
          return u'is still failing'
      if status == 'success':
          return u'succeeded'
      return status
  
subject: Use Python 3 type syntax in zerver/webhooks/circleci/view.py