code: def convert_dict_keys(func, in_dict):
      """Apply a conversion function to all keys in a dict.
  
      Parameters
      ----------
      func : callable
          The function to apply. Takes a str and returns a str.
      in_dict : dict
          The dictionary to convert. If some value in this dict is itself a dict,
          it also gets recursively converted.
  
      Returns
      -------
      dict
          A new dict with all the contents of `in_dict`, but with the keys
          converted by `func`.
  
      """
      out_dict = dict()
      for k, v in in_dict.items():
          converted_key = func(k)
  
          if type(v) is dict:
              out_dict[converted_key] = convert_dict_keys(func, v)
          else:
              out_dict[converted_key] = v
      return out_dict
  
imports: import re
label_desc: Use image node_id 4 for calling a global function with example usage: convert_dict_keys(func, in_dict) and returns: out_dict