code: def set(self, key, value, timeout=None):
      self.key = key
      self.value = value
      self.timeout = timeout
  
imports: import pytest
  from jinja2 import Environment
  from jinja2.bccache import Bucket
  from jinja2.bccache import FileSystemBytecodeCache
  from jinja2.bccache import MemcachedBytecodeCache
  from jinja2.exceptions import TemplateNotFound
label_desc: Use image node_id 2 for calling the MockMemcached obj's underlying member method code with example usage: obj.set(key, value, timeout) without return types