Arguments lifetime when C++ call python

[randgun]

Hi developers:

Is it different to call python function using
C++?

1. py::object ret = py_instance.attr(“call”)(pylist)
2. py_instance.attr(“call”)(pylist)

I just wonder whether this calls is synchronized or not, because I am worried about pylist is released by c++, and because pybind use reference pass as default (maybe?), it is possible to get empty object in python code.

But if I add a return value, c++ must wait for the python function returns, so pylist could not be released in advance.

Could anyone help to answer this question?