code: def getitem_in(obj, name):
      
      for part in name.split('.'):
          obj = obj[part]
      return obj
docs: Finds a key in @obj via a period-delimited string @name.
          @obj: (#dict)
          @name: (#str) |.|-separated keys to search @obj in
          ..
              obj = {'foo': {'bar': {'baz': True}}}
              getitem_in(obj, 'foo.bar.baz')
          ..
          |True|