old_contents: from __future__ import print_function
  import requests
  import json
  import sys
  import time
  
  class Base:
      def get(self, url, email=None, password=None):
          session = requests.Session()
          session.auth = (email, password)
          response_raw = session.get(url)
  
          if response_raw.status_code == 429:
              time.sleep(response_raw.headers['Retry-After'])
              return get(url, email, password)
  
          else:
              response_json = json.loads(response_raw.content)
              return response_json
  
      def put(self, url, data, email=None, password=None):
          session = requests.Session()
          session.auth = (email, password)
          session.headers = {'Content-Type': 'application/json'}
          response_raw = session.put(url, data)
  
          if response_raw.status_code == 429:
              time.sleep(response_raw.headers['Retry-After'])
              return put(url, data, email, password)
  
          else:
              return response_raw
  
      def post(self, url, data, email=None, password=None):
          session = requests.Session()
          session.auth = (email, password)
          session.headers = {'Content-Type': 'application/json'}
          response_raw = session.post(url, data)
  
          if response_raw.status_code == 429:
              time.sleep(response_raw.headers['Retry-After'])
              return put(url, data, email, password)
  
          else:
              return response_raw
  
      def delete(self, url, email=None, password=None):
          session = requests.Session()
          session.auth = (email, password)
          response_raw = session.delete(url)
  
          if response_raw.status_code == 429:
              time.sleep(response_raw.headers['Retry-After'])
              return put(url, data, email, password)
  
          else:
              return response_raw
  
new_contents: from __future__ import print_function
  import requests
  import json
  import sys
  import time
  
  class Base:
      def get(self, url, email=None, password=None):
          session = requests.Session()
          session.auth = (email, password)
          response_raw = session.get(url)
  
          if response_raw.status_code == 429:
              time.sleep(response_raw.headers['Retry-After'])
              return get(url, email, password)
  
          else:
              if response_raw.headers['Content-Type'] == "application/json; charset=utf-8":
                  response_json = json.loads(response_raw.content)
                  return response_json
              else:
                  return None
  
      def put(self, url, data, email=None, password=None):
          session = requests.Session()
          session.auth = (email, password)
          session.headers = {'Content-Type': 'application/json'}
          response_raw = session.put(url, data)
  
          if response_raw.status_code == 429:
              time.sleep(response_raw.headers['Retry-After'])
              return put(url, data, email, password)
  
          else:
              if response_raw.headers['Content-Type'] == "application/json; charset=utf-8":
                  response_json = json.loads(response_raw.content)
                  return response_json
              else:
                  return None
  
      def post(self, url, data, email=None, password=None):
          session = requests.Session()
          session.auth = (email, password)
          session.headers = {'Content-Type': 'application/json'}
          response_raw = session.post(url, data)
  
          if response_raw.status_code == 429:
              time.sleep(response_raw.headers['Retry-After'])
              return put(url, data, email, password)
  
          else:
              if response_raw.headers['Content-Type'] == "application/json; charset=utf-8":
                  response_json = json.loads(response_raw.content)
                  return response_json
              else:
                  return None
  
      def delete(self, url, email=None, password=None):
          session = requests.Session()
          session.auth = (email, password)
          response_raw = session.delete(url)
  
          if response_raw.status_code == 429:
              time.sleep(response_raw.headers['Retry-After'])
              return put(url, data, email, password)
  
          else:
              if response_raw.headers['Content-Type'] == "application/json; charset=utf-8":
                  response_json = json.loads(response_raw.content)
                  return response_json
              else:
                  return None
  
subject: Fix return values in ZendeskBase