Lambda

class astroid.nodes.Lambda(lineno: int, col_offset: int, parent: NodeNG, *, end_lineno: int | None, end_col_offset: int | None)

Bases: FilterStmtsBaseNode, LocalsDictNodeNG

Class representing an ast.Lambda node.

>>> import astroid
>>> node = astroid.extract_node('lambda arg: arg + 1')
>>> node
<Lambda.<lambda> l.1 at 0x7f23b2e41518>

argnames() → list[str]

Get the names of each of the arguments, including that of the collections of variable-length arguments (“args”, “kwargs”, etc.), as well as positional-only and keyword-only arguments.

Returns:

The names of the arguments.

Return type:

list(str)

args: Arguments

The arguments that the function takes.

body: NodeNG

The contents of the function body.

bool_value(context: InferenceContext | None = None) → Literal[True]

Determine the boolean value of this node.

Returns:

The boolean value of this node. For a Lambda this is always True.

callable() → Literal[True]

Whether this node defines something that is callable.

Returns:

Whether this defines something that is callable For a Lambda this is always True.

display_type() → str

A human readable type of this node.

Returns:

The type of this node.

Return type:

str

frame(*, future: Literal[None, True] = None) → _T

The node’s frame node.

A frame node is a Module, FunctionDef, ClassDef or Lambda.

Returns:

The node itself.

get_children()

Get the child nodes below this node.

getattr(name: str, context: InferenceContext | None = None) → list[NodeNG]

implicit_parameters() → Literal[0]

infer_call_result(caller: SuccessfulInferenceResult | None, context: InferenceContext | None = None) → Iterator[InferenceResult]

Infer what the function returns when called.

is_lambda: ClassVar[bool] = True

locals: dict[str, list[InferenceResult]]

A map of the name of a local variable to the node defining it.

name = '<lambda>'

postinit(args: Arguments, body: NodeNG) → None

pytype() → Literal['builtins.instancemethod', 'builtins.function']

Get the name of the type that this node represents.

Returns:

The name of the type.

scope_lookup(node: LookupMixIn, name: str, offset: int = 0) → tuple[LocalsDictNodeNG, list[NodeNG]]

Lookup where the given names is assigned.

Parameters:

• node – The node to look for assignments up to. Any assignments after the given node are ignored.

• name – The name to find assignments for.

• offset – The line offset to filter statements up to.

Returns:

This scope node and the list of assignments associated to the given name according to the scope where it has been found (locals, globals or builtin).

special_attributes

The names of special attributes that this function has.

property type: Literal['method', 'function']

Whether this is a method or function.

Returns:

‘method’ if this is a method, ‘function’ otherwise.