Jesper Stemann Andersen (Aug 15 2023 at 14:26): Jesper Stemann Andersen (Aug 15 2023 at 14:26):I am trying to use PythonCall.pytype to define a sub-class of a Python class - i.e. to define it using Julia code, but so far I can not figure out how to do the super().__init__(...) constructor call...
julia> using PythonCall
julia> Foo = pytype("Foo", (), [
"__module__" => "__main__",
pyfunc(
name = "__init__",
function (self, y = nothing)
self.y = y
return
end,
),
pyfunc(
name = "__repr__",
self -> "Foo($(self.y))",
),
])
Python: <class '__main__.Foo'>
julia> Bar = pytype("Bar", (Foo,), [
"__module__" => "__main__",
pyfunc(
name = "__init__",
function (self, x, y = nothing)
pyeval(Any, "super().__init__(y)", @__MODULE__, (self = self, y = y))
self.x = x
return
end,
),
pyfunc(
name = "__repr__",
self -> "Bar($(self.x), $(self.y))",
),
])
Python: <class '__main__.Bar'>
julia> Foo()
Python: Foo(None)
julia> Foo(1)
Python: Foo(1)
julia> Bar(2)
ERROR: Python: RuntimeError: super(): no arguments
...
Any tips?
Jesper Stemann Andersen (Aug 15 2023 at 14:38):pybuiltins.super() seems promising...
julia> Bar = pytype("Bar", (Foo,), [
"__module__" => "__main__",
pyfunc(
name = "__init__",
function (self, x, y = nothing)
pybuiltins.super().__init__(y)
# pyeval(Any, "super().__init__(y)", @__MODULE__, (self = self, y = y))
self.x = x
return
end,
),
pyfunc(
name = "__repr__",
self -> "Bar($(self.y), $(self.y))",
),
])
Python: <class '__main__.Bar'>
julia> Bar(2)
ERROR: Python: RuntimeError: super(): __class__ cell not found
...
Likely related open Python bug: https://bugs.python.org/issue29944
Jesper Stemann Andersen (Aug 15 2023 at 14:44):Solution:
julia> Bar = pytype("Bar", (Foo,), [
"__module__" => "__main__",
pyfunc(
name = "__init__",
function (self, x, y = nothing)
pybuiltins.super(self.__class__, self).__init__(y)
self.x = x
return
end,
),
pyfunc(
name = "__repr__",
self -> "Bar($(self.x), $(self.y))",
),
])
Python: <class '__main__.Bar'>
julia> Foo()
Python: Foo(None)
julia> Foo(1)
Python: Foo(1)
julia> Bar(2)
Python: Bar(2, None)
julia> Bar(2, 3)
Python: Bar(2, 3)
Jesper Stemann Andersen has marked this topic as resolved.
Last updated: Oct 02 2023 at 04:34 UTC