code: def get_environment(self):
          '''
          Return a dictionary representing the environment variables used to
          set the proxy settings.
          '''
          env = {}
          if self.http:
              env['http_proxy'] = env['HTTP_PROXY'] = self.http
          if self.https:
              env['https_proxy'] = env['HTTPS_PROXY'] = self.https
          if self.ftp:
              env['ftp_proxy'] = env['FTP_PROXY'] = self.ftp
          if self.no_proxy:
              env['no_proxy'] = env['NO_PROXY'] = self.no_proxy
          return enf get_environment(self):
          '''
          Return a dictionary representing the environment variables used to
          set the proxy settings.
          '''
          env = {}
          if self.http:
              env['http_proxy'] = env['HTTP_PROXY'] = self.http
          if self.https:
              env['https_proxy'] = env['HTTPS_PROXY'] = self.https
          if self.ftp:
              env['ftp_proxy'] = env['FTP_PROXY'] = self.ftp
          if self.no_proxy:
              env['no_proxy'] = env['NO_PROXY'] = self.no_proxy
          return env
docs: Return a dictionary representing the environment variables used to
          set the proxy settings.