Unable to use numpy

OS: Ubuntu 19.04 64-bit
Python: Python 3.7.3
Rust: 1.35.0

I'm unable to use numpy in my test project.

1. I tried to use numpy in my project, and I got an error saying there wasn't a module called numpy. I created a virtual environment with numpy, scipy, and matplotlib. I installed these modules with pip, and was able to confirm that they work with a simple test script which plots random numbers.
2. I ran into the __file__ issue in numpy.__config__, where it tries to look for an extra .libs directory. I replaced that line with a hardcoded string value.
3. I tried with and without sys_paths = ["$ORIGIN/lib"] in embedded_python_config, it didn't seem to make a difference.
4. Ultimately, I get this error: No module named 'numpy.core._multiarray_umath'.

I made sure that the gfortran, libopenblas, and other dependencies were installed, in case that was part of the issue, but it didn't help. Ultimately, I'd like to use this project to make a more portable version of a larger project which has a few C-based module dependencies.

Start by reproducing the packaged test project with the reported Ubuntu, Python, and Rust versions, then inspect numpy.config and the embedded_python_config setting mentioned in the report. Done means the packaged project imports numpy successfully, including numpy.core._multiarray_umath, without requiring manual edits or external dependency workarounds.