code: def _set_sub_prop(container, keys, value):
      
      sub_val = container
      for key in keys[:-1]:
          if key not in sub_val:
              sub_val[key] = {}
          sub_val = sub_val[key]
      sub_val[keys[-1]] = value
docs: Set a nested value in a dictionary.
  
      Arguments:
          container (dict):
              A dictionary which may contain other dictionaries as values.
          keys (iterable):
              A sequence of keys to attempt to set the value for. Each item in
              the sequence represents a deeper nesting. The first key is for
              the top level. If there is a dictionary there, the second key
              attempts to get the value within that, and so on.
          value (object): Value to set within the container.
  
      Examples:
          Set a top-level value (equivalent to ``container['key'] = 'value'``).
  
          >>> container = {}
          >>> _set_sub_prop(container, ['key'], 'value')
          >>> container
          {'key': 'value'}
  
          Set a nested value.
  
          >>> container = {}
          >>> _set_sub_prop(container, ['key', 'subkey'], 'value')
          >>> container
          {'key': {'subkey': 'value'}}
  
          Replace a nested value.
  
          >>> container = {'key': {'subkey': 'prev'}}
          >>> _set_sub_prop(container, ['key', 'subkey'], 'new')
          >>> container
          {'key': {'subkey': 'new'}}