[BUG]: AttributeError: module has no attribute

[NuLL3rr0r]

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What version (or hash if on master) of pybind11 are you using?

2.10.3

Problem description

OK, I am trying to export the following simple Add function (I took the example from the online tutorial on the pybind11 website) without any success:

#include <cstdint>
#include <pybind11/pybind11.h>

int32_t Add(int32_t a, int32_t b) {
    return a + b;
}

PYBIND11_MODULE(SGPYCPP_MODULE_NAME, m) {
    m.doc() = "A simple Python/C++ example";

    m.def("Add", &Add, "A function that adds two numbers");
}

When I import it, it imports my module, but says it has no attribute named Add:

python3
Python 3.7.3 (default, Jan 22 2021, 20:04:44) 
[GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import SGPyCpp
>>> SGPyCpp.Add(2,1)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: module 'SGPyCpp' has no attribute 'Add'
>>> 

I even tried to name my module example and use the exact sample from the official online tutorial to leave out any other possibility without any luck:

int add(int i, int j) {
    return i + j;
}

PYBIND11_MODULE(example, m) {
    m.doc() = "pybind11 example plugin"; // optional module docstring

    m.def("add", &add, "A function that adds two numbers");
}

I even tried to comment on most of CMakeLists.txt and reduced it to the sample from here without any luck.

I'll attach the full source code as a zip file in order to replicate the issue. After extraction, just issue:

make clean && make

SGPyCpp.zip

I'd appreciate it if you'd let me know what's wrong.

Reproducible example code

A full example is provided in the zip file:


#include <cstdint>
#include <pybind11/pybind11.h>

int32_t Add(int32_t a, int32_t b) {
    return a + b;
}

PYBIND11_MODULE(SGPYCPP_MODULE_NAME, m) {
    m.doc() = "A simple Python/C++ example";

    m.def("Add", &Add, "A function that adds two numbers");
}

### Is this a regression? Put the last known working version here if it is.

Not a regression