code: def purge_keys(self):
          
          r = self.local_renderer
          r.env.default_ip = self.hostname_to_ip(self.env.default_hostname)
          r.env.home_dir = '/home/%s' % getpass.getuser()
          r.local('ssh-keygen -f "{home_dir}/.ssh/known_hosts" -R {host_string}')
          if self.env.default_hostname:
              r.local('ssh-keygen -f "{home_dir}/.ssh/known_hosts" -R {default_hostname}')
          if r.env.default_ip:
              r.local('ssh-keygen -f "{home_dir}/.ssh/known_hosts" -R {default_ip}')
docs: Deletes all SSH keys on the localhost associated with the current remote host.