code: def _del_sub_prop(container, keys):
      
      sub_val = container
      for key in keys[:-1]:
          if key not in sub_val:
              sub_val[key] = {}
          sub_val = sub_val[key]
      if keys[-1] in sub_val:
          del sub_val[keys[-1]]
docs: Remove a nested key fro a dictionary.
  
      Arguments:
          container (dict):
              A dictionary which may contain other dictionaries as values.
          keys (iterable):
              A sequence of keys to attempt to clear 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.
  
      Examples:
          Remove a top-level value (equivalent to ``del container['key']``).
  
          >>> container = {'key': 'value'}
          >>> _del_sub_prop(container, ['key'])
          >>> container
          {}
  
          Remove a nested value.
  
          >>> container = {'key': {'subkey': 'value'}}
          >>> _del_sub_prop(container, ['key', 'subkey'])
          >>> container
          {'key': {}}