typing.py 文件源码

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

    Usage::

        Employee = typing.NamedTuple('Employee', [('name', str), 'id', int)])

    This is equivalent to::

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

    The resulting class has one extra attribute: _field_types,
    giving a dict mapping field names to types.  (The field names
    are in the _fields attribute, which is part of the namedtuple
    API.)
    """
    fields = [(n, t) for n, t in fields]
    cls = collections.namedtuple(typename, [n for n, t in fields])
    cls._field_types = dict(fields)
    # Set the module to the caller's module (otherwise it'd be 'typing').
    try:
        cls.__module__ = sys._getframe(1).f_globals.get('__name__', '__main__')
    except (AttributeError, ValueError):
        pass
    return cls