[Bug]: TypeError upon import

[ljlamarche]

What happened?

When attempting to import pymap3d, I get the following TypeError:

TypeError: expected string or bytes-like object

I have attempted to reinstall pymap3d, but the error persists.

Computer: MacOS
Python: 3.9.15

Relevant log output

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/e30737/miniconda3/envs/py39/lib/python3.9/site-packages/pymap3d/__init__.py", line 34, in <module>
    from .aer import aer2ecef, aer2geodetic, ecef2aer, geodetic2aer
  File "/Users/e30737/miniconda3/envs/py39/lib/python3.9/site-packages/pymap3d/aer.py", line 7, in <module>
    from .ecef import ecef2enu, ecef2geodetic, enu2uvw, geodetic2ecef
  File "/Users/e30737/miniconda3/envs/py39/lib/python3.9/site-packages/pymap3d/ecef.py", line 7, in <module>
    from .eci import ecef2eci, eci2ecef
  File "/Users/e30737/miniconda3/envs/py39/lib/python3.9/site-packages/pymap3d/eci.py", line 10, in <module>
    import astropy.units as u
  File "/Users/e30737/miniconda3/envs/py39/lib/python3.9/site-packages/astropy/units/__init__.py", line 17, in <module>
    from .quantity import *
  File "/Users/e30737/miniconda3/envs/py39/lib/python3.9/site-packages/astropy/units/quantity.py", line 25, in <module>
    from astropy.utils.compat import NUMPY_LT_1_22
  File "/Users/e30737/miniconda3/envs/py39/lib/python3.9/site-packages/astropy/utils/compat/__init__.py", line 19, in <module>
    from .numpycompat import *  # noqa
  File "/Users/e30737/miniconda3/envs/py39/lib/python3.9/site-packages/astropy/utils/compat/numpycompat.py", line 14, in <module>
    NUMPY_LT_1_19 = not minversion('numpy', '1.19')
  File "/Users/e30737/miniconda3/envs/py39/lib/python3.9/site-packages/astropy/utils/decorators.py", line 546, in wrapper
    return function(*args, **kwargs)
  File "/Users/e30737/miniconda3/envs/py39/lib/python3.9/site-packages/astropy/utils/introspection.py", line 167, in minversion
    return Version(module_version) >= Version(version)
  File "/Users/e30737/miniconda3/envs/py39/lib/python3.9/site-packages/packaging/version.py", line 264, in __init__
    match = self._regex.search(version)
TypeError: expected string or bytes-like object

[scivision]

I just tried with Python 3.9.15 and didn't see the same AstroPy import issue. Can you tell the Astropy version like:

 python -c "import numpy,astropy; print('Numpy ', numpy.__version__, ' AstroPy', astropy.__version__)"

Numpy 1.23.4 AstroPy 5.1

[ljlamarche]

Ah, sorry, I had forgotten about this. It was an astropy issue. Manually updating astropy (which I hadn't done for some time) solved the problem. Unfortunately I don't recall what astropy version I was at before, but it works for me now with 5.0.1.

[scivision]

OK thanks!