[SOLVED] Package installed in conda but module not found. How is that possible?

Package installed in conda but module not found. How is that possible?

It seems that many people struggle with this problem, but I can't find any answer that works. I think that I am doing everything right but it still doesn't work. I've built my own package and installed it in my conda environment. When I do conda list, it turns up in the list, at the end (I've called it zzpackagerps):

...
zlib                      1.2.11            h62dcd97_1010    conda-forge
zstd                      1.4.9                h6255e5f_0    conda-forge
zzpackagerps              0.0.1                     dev_0    <develop>

Now when I run python, in this environment (py39), and try to import the package, I get the infamous ModuleNotFoundError:

(py39) s:\Sources>python
Python 3.9.4 | packaged by conda-forge | (default, May 10 2021, 22:10:34) [MSC v.1916 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import zzpackagerps
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'zzpackagerps'
>>>

How is this possible? Or, more importantly, how do I get this to work?
(by the way: running on Windows)

Solution

One possible issue is that the package name may not be identical to the module name. If you locate the site-packages where the package is installed, you can try looking at the folder structure and where there are __init__.py files defined.