def map_dict_to_lower(input_dict):
 lower_case_dict = {}
 for key in input_dict:
  lower_case_dict[key.lower()] = input_dict[key]
 return lower_case_dict

def map_dict_to_lower ( input_dict ) : lower_case_dict = { } for key in input_dict : lower_case_dict [ key . lower ( ) ] = input_dict [ key ] return lower_case_dict
return an equivalent to the input dictionary with lower-case keys .