attr*

Syntax: (item* OBJ KEY ...), (attr* OBJ NAME ...)

Behaviour: Left-nested item and attr chains: (item* d "a" "b") is (item (item d "a") "b"), and (attr* os path sep) is (attr (attr os path) sep). Each step is a plain lookup that raises when a key or attribute is missing. For a chained lookup with a default or a presence test, the runtime functions getitem* and hasitem* and getattr* and hasattr* take the path at run time.

Examples:

>>> (item* #{"a": #{"b": 2}} "a" "b")
2
>>> (import os)
>>> (attr* os path sep)
"/"

The suffix spellings d["a"]["b"] and os.path.sep read to the same chains.