[Feature Request] Optimize PythonObject.__contains__ with a CPython API function

[rd4com]

Review Mojo's priorities

• I have read the roadmap and priorities and I believe this request falls within the priorities.

What is your request?

Hello, we have PythonObject.__contains__ working: #3101

It would be nice if somebody could optimize it with the corresponding CPython API 👍

Here is the current implementation:

if cpython.PyObject_HasAttrString(self.py_object, "__contains__"):
    return self._call_single_arg_method("__contains__", rhs).__bool__()
for v in self:
    if v == rhs:
        return True
return False

What is your motivation for this change?

To speedup the PythonObject.__contains__,
and by using the CPython functions,
it would not have to change a lot later 👍

Any other details?

Ping to @JoeLoser ,
(suggested the feature request in a PR 👍 )