code: def mkdir(self, dirname):
      sn = self._device_id
      execute("adb -s %s shell mkdir -p %s" % (sn, dirname))
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import copy
  import os
  import re
  import subprocess
  import random
  import tempfile
  from utils import util
label_desc: Use image node_id 7 for calling the AndroidDevice obj's underlying member method code with example usage: obj.mkdir(dirname) without return types