class_docstr: `dict`-like object which acts as if the value for any key is the key itself. Objects
  of this class can be passed in to arguments like `color_discrete_map` to
  use the provided data values as colors, rather than mapping them to colors cycled
  from `color_discrete_sequence`. This works for any `_map` argument to Plotly Express
  functions, such as `line_dash_map` and `symbol_map`.
class_docstr_tok: ["`","dict","`","-like","object","which","acts","as","if","the","value","for","any","key","is","the","key","itself",".","Objects","of","this","class","can","be","passed","in","to","arguments","like","`","color_discrete_map","`","to","use","the","provided","data","values","as","colors",",","rather","than","mapping","them","to","colors","cycled","from","`","color_discrete_sequence","`",".","This","works","for","any","`","_map","`","argument","to","Plotly","Express","functions",",","such","as","`","line_dash_map","`","and","`","symbol_map","`","."]
code: def __contains__(self, key):
      return True
  
file_path: catboost/contrib/python/plotly/py3/plotly/express/_special_inputs.py
label_desc: Use image node_id 2 for calling the IdentityMap obj's underlying member method code with example usage: obj.__contains__(key) and returns: True