docstr:  Get a function by the function name
  
  :param str function_name: name of the original function
docstr_tok: ["Get","a","function","by","the","function","name",":","param","str","function_name",":","name","of","the","original","function"]
code: def get_func_by_name(self, function_name: str) -> Callable:
      """
       Get a function by the function name
  
      :param str function_name: name of the original function
      """
      dim, htype, key = self._get_func_properties_by_name(function_name)
      return self._properties_to_func[dim][htype][key]
  
file_path: popmon/popmon/base/registry.py
imports: from __future__ import annotations
  from collections import defaultdict
  from typing import Any, Callable
label_desc: Use image node_id 4 for calling the Registry obj's underlying member method code with example usage: obj.get_func_by_name(function_name) and returns: self