class_docstr: Class to register the magic with Colab.
  
  Objects of this class delegate all calls to a single,
  global instance.
class_docstr_tok: ["Class","to","register","the","magic","with","Colab",".","Objects","of","this","class","delegate","all","calls","to","a","single",",","global","instance","."]
docstr: Retrieve global instance of the Magics object.
docstr_tok: ["Retrieve","global","instance","of","the","Magics","object","."]
code: def get_instance(cls) -> AbstractMagics:
      """Retrieve global instance of the Magics object."""
      if cls._instance is None:
          cls._instance = MagicsImpl()
      return cls._instance
  
imports: from __future__ import annotations
  import abc
  from google.auth import credentials
  from google.generativeai import client
  from google.generativeai.notebook import gspread_client
  from google.generativeai.notebook import ipython_env
  from google.generativeai.notebook import ipython_env_impl
  from google.generativeai.notebook import magics_engine
  from google.generativeai.notebook import post_process_utils
  from google.generativeai.notebook import sheets_utils
  import IPython
  from IPython.core import magic
label_desc: Use image node_id 1 for calling the Magics obj's underlying member method code with example usage: obj.get_instance(cls) and returns: cls