code: def set_by_dotted_path(d, path, value):
      
      split_path = path.split('.')
      current_option = d
      for p in split_path[:-1]:
          if p not in current_option:
              current_option[p] = dict()
          current_option = current_option[p]
      current_option[split_path[-1]] = value
docs: Set an entry in a nested dict using a dotted path.
  
      Will create dictionaries as needed.
  
      Examples
      --------
      >>> d = {'foo': {'bar': 7}}
      >>> set_by_dotted_path(d, 'foo.bar', 10)
      >>> d
      {'foo': {'bar': 10}}
      >>> set_by_dotted_path(d, 'foo.d.baz', 3)
      >>> d
      {'foo': {'bar': 10, 'd': {'baz': 3}}}