why I failed to use a vector reference in a function?

[xiaoxiongli]

in C++ file:

void load_data2(std::vector& data)
{
data[0] =2;
}
PYBIND11_MODULE(libmy_project, m)

in python file:
data = [0]
libmy_project.load_data2(data)
print(data)

the result is [0], Why ? I feel confuse why data not changed?

[wuguinianjing]

me too