What is the method for configuring a single default argument in pybind11?

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To configure a single default argument in pybind11, one can define the function using the py::arg keyword and provide a default value for the argument. Here's an example:

#include <pybind11/pybind11.h>

namespace py = pybind11;

int add(int x, int y=0) {
    return x + y;
}

PYBIND11_MODULE(example, m) {
    m.def("add", &add, py::arg("x"), py::arg("y")=0);
}

In this example, the add function takes two arguments, x and y, with y having a default value of 0. To define this function in pybind11, we use the py::arg keyword to specify the name of each argument and its default value.

Note that when using default arguments in pybind11, it's important to define the function in the correct order. Any default argument must come after all non-default arguments in the function definition.