code: def set_context(self, key, value):
      with self._lock:
          self.ctx[key] = value
  
imports: import json
  import threading
  import urllib
  from unittest.mock import MagicMock
  import requests
label_desc: Use image node_id 2 for calling the RequestsMock obj's underlying member method code with example usage: obj.set_context(key, value) without return types