How can i pass a python object to Rust, and invoke a callback function

[unigrav-tech]

If I have a python class A
class A:
def cb(**kwargs):
dict = {...}
return dict

And I want to pass an instance of class A to Rust, and invoke the cb() function in the Rust, like:

let mut args = Hashmap::new()
...
let result = instanceOfA.cb(args)
...

[adamreichold]

Your Rust function can accept instanceOfA: &PyAny and invoke cb via

let res = instanceOfA.call1(args)?;