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PEP 484: Allow deriving NewType from another unique type #271

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May 30, 2017
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PEP 484: Allow deriving NewType from another unique type #271

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5 changes: 3 additions & 2 deletions pep-0484.txt
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Expand Up @@ -1590,8 +1590,9 @@ from ``UserId`` where ``int`` is expected. Examples::
num = UserId(5) + 1 # type: int

``NewType`` accepts exactly two arguments: a name for the new unique type,
and a base class. The latter should be a proper class, i.e.,
not a type construct like ``Union``, etc. The function returned by ``NewType``
and a base class. The latter should be a proper class (i.e.,
not a type construct like ``Union``, etc.), or another unique type created
by calling ``NewType``. The function returned by ``NewType``
accepts only one argument; this is equivalent to supporting only one
constructor accepting an instance of the base class (see above). Example::

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