Syntax for specifying Metaclasses in Hy

Question

What is the syntax for for specifying metaclasses in Hy. I tried the following:

(defclass Metaclass [] )

(defclass Foo [ :meta Metaclass ] )
(defclass Foo [ [:meta Metaclass] ] )

but this did not work

Answer 1

You do it the same way you would in Python.

This is on Python 3 and the latest master of Hy, and using the --spy option in the repl to show the Python compilation.

=> (defclass Foo [:metaclass print])
class Foo(metaclass=print):
    pass


None

Foo () {'__module__': '__console__', '__qualname__': 'Foo'}

On Python 2.

=> (defclass Foo []
...  (setv __metaclass__ print))
class Foo:
    __metaclass__ = print


None

Foo () {'__module__': '__console__', '__metaclass__': <built-in function print>}

If you need it to work for either, you could try installing the six compatibility library.