Function NamedTuple

Lib/typing.py:3090–3114

Typed version of namedtuple. Usage:: class Employee(NamedTuple): name: str id: int This is equivalent to:: Employee = collections.namedtuple('Employee', ['name', 'id']) The resulting class has an extra __annotations__ attribute, giving a d

(typename, fields, /)

def NamedTuple(typename, fields, /):
    """Typed version of namedtuple.

    Usage::

        class Employee(NamedTuple):
            name: str
            id: int

    This is equivalent to::

        Employee = collections.namedtuple('Employee', ['name', 'id'])

    The resulting class has an extra __annotations__ attribute, giving a
    dict that maps field names to types.  (The field names are also in
    the _fields attribute, which is part of the namedtuple API.)
    An alternative equivalent functional syntax is also accepted::

        Employee = NamedTuple('Employee', [('name', str), ('id', int)])
    """
    types = {n: _type_check(t, f"field {n} annotation must be a type")
             for n, t in fields}
    nt = _make_nmtuple(typename, types, _make_eager_annotate(types), module=_caller())
    nt.__orig_bases__ = (NamedTuple,)
    return nt

_NamedTuple = type.__new__(NamedTupleMeta, 'NamedTuple', (), {})