old_contents: import os
  import requests
  import json
  
  
  class SendSMS():
  
      def send_sms(self, buyer_nickname, buyer_phone, saler_phone, selected_bookname):
          appid = os.environ.get("APPID")
          apikey = os.environ.get("APIKEY")
  
          sender = '01020370706'
          receivers = [saler_phone, ]
  
          content = u'[북커넥트]'+ selected_bookname + ' 판매요청. 요청자 번호:'+ buyer_phone
  
          url = os.environ.get("URL")
  
          params = {
                  'sender': sender,
                  'receivers': receivers,
                  'content': content,
          }
          headers = {'Content-type': 'application/json; charset=utf-8', }
          r = requests.post(url, data=json.dumps(params), auth=(appid, apikey), headers=headers)
  
          return params
  
new_contents: import os
  import requests
  import json
  
  
  class SendSMS():
  
      def send_sms(self, buyer_nickname, buyer_phone, saler_phone, selected_bookname):
          appid = os.environ.get("APPID")
          apikey = os.environ.get("APIKEY")
  
          sender = '01020370706'
          receivers = [saler_phone, ]
  
          content = u'[북커넥트]' + selected_bookname + ' 판매요청. 요청자 번호:' + buyer_phone
  
          url = os.environ.get("URL")
  
          params = {
                  'sender': sender,
                  'receivers': receivers,
                  'content': content,
          }
          headers = {'Content-type': 'application/json; charset=utf-8', }
          r = requests.post(url, data=json.dumps(params), auth=(appid, apikey), headers=headers)
  
          return params
  
subject: update : modify pep8