Has inputs mixin

Mixins for pipeline steps.

HasInputsMixin(input_map=None)

Mixin class for steps that consume a unified input_map.

The input_map maps argument names to a state/config key (str), a fixed value (Val), or a grouped wrapper (Group). Resolution semantics: 1. For str specs: read from state first; if missing, fall back to config["configurable"]. String specs can use dot notation (e.g. "a.b.c") for nested dictionary or attribute access. 2. For Val specs: use the literal value.

Attributes:

Name	Type	Description
input_map	dict[str, str | Val | Group]	Mapping of argument names to a state/config key (str), a fixed value (Val), or a grouped wrapper (Group).

Initialize with a unified input_map.

Parameters:

Name	Type	Description	Default
input_map	InputMapSpec | None	Mapping of argument names to a state/config key (str), a fixed value (Val), or a grouped wrapper (Group). Also accepts a list form for ergonomics: 1. str: identity mapping ("key" -> {"key": "key"}) 2. dict[str, str]: explicit mapping to state/config key 3. dict[str, Val]: fixed/literal value 4. dict[str, Group]: grouped wrapper around a lookup or literal spec Defaults to None, in which case an empty mapping is used.	None

input_state_keys property

Top-level state keys this step reads from the pipeline state.

Derived from keys in input_map. Returns None when the step has no input declaration (— it may read any key available in state at execution time).

Returns:

Type	Description
set[str] | None	set[str] | None: Known input state keys, or None if unrestricted.