class_docstr: Adds obj[key] access to a mapped class.
  
  This class basically proxies dictionary access to an attribute
  called ``_proxied``.  The class which inherits this class
  should have an attribute called ``_proxied`` which points to a dictionary.
class_docstr_tok: ["Adds","obj","[","key","]","access","to","a","mapped","class",".","This","class","basically","proxies","dictionary","access","to","an","attribute","called","``","_proxied","``",".","The","class","which","inherits","this","class","should","have","an","attribute","called","``","_proxied","``","which","points","to","a","dictionary","."]
code: def __delitem__(self, key):
      del self._proxied[key]
  
file_path: sqlalchemy/examples/vertical/dictlike.py
imports: from sqlalchemy import and_
  from sqlalchemy import Column
  from sqlalchemy import create_engine
  from sqlalchemy import ForeignKey
  from sqlalchemy import Integer
  from sqlalchemy import Unicode
  from sqlalchemy import UnicodeText
  from sqlalchemy.ext.associationproxy import association_proxy
  from sqlalchemy.ext.declarative import declarative_base
  from sqlalchemy.orm import relationship
  from sqlalchemy.orm import Session
  from sqlalchemy.orm.collections import attribute_keyed_dict
label_desc: Use image node_id 6 for calling the ProxiedDictMixin obj's underlying member method code with example usage: obj.__delitem__(key) without return types