code: def _setattr(self, key, value, silent=False):
      splits = key.split(".")
      target = self
      for k in splits[:-1]:
          if not silent and (
              not isinstance(target, AttributeDict) or k not in target
          ):
              raise OptionError(
                  "You can only set the value of existing options"
              )
          target = target[k]
      key = splits[-1]
  
      if not isinstance(value, AttributeDict):
          validate = None
          if key in target:
              val = target[key]
              validate = target[key][1]
              if validate is not None:
                  if not validate(value):
                      raise ValueError(f"Cannot set value `{value}`")
              if isinstance(val[0], Redirection):
                  val[0].setvalue(value)
              else:
                  target[key] = value, validate
          else:
              target[key] = value, validate
      else:
          target[key] = value
  
imports: import contextlib
  import functools
  import operator
  import os
  import warnings
  import threading
  from copy import deepcopy
  from typing import Union, Dict
label_desc: Use image node_id 7 for calling the AttributeDict obj's underlying member method code with example usage: obj._setattr(key, value, silent) without return types