Messes up python's import?

[wusspuss]

tohil::exec {import mymodule} or tohil::import mymodule will both complain No module named 'mymodule' (while evaluating python code) from python code executed by tohil whereas a mymodule.py exists in same dir the script is running from. import mymodule from normal python works fine. Importing system modules through tohil works fine. Tohil passes all tests.

I also noticed python's cffi module is broken in a similar manner: cffi itself imports fine, but smth like
ffi.set_source("_test", "..."); ffi.compile(); from _test import lib
Will again complain of module _test not being found, whereas it will work fine in standalone python

[NasaGeek]

tohil initializes the Python interpreter differently than the python executable. This results in the contents of sys.path being subtly different.

A demonstration:

I [nix-shell:~/scratch]$ tclsh <<< "package require tohil; tohil::import sys; tohil::exec {print(sys.path)}"
['/nix/store/1cc2qcz3p1sisss7a0w0b82w8zki6cv1-python3.8-tohil-4.4.2/lib/python3.8/site-packages', '/nix/store/ksv01pa19hgnpyni4qvc90bq5y0y6n7g-python3-3.8.12/lib/python3.8/site-packages', '/nix/store/ksv01pa19hgnpyni4qvc90bq5y0y6n7g-python3-3.8.12/lib/python38.zip', '/nix/store/ksv01pa19hgnpyni4qvc90bq5y0y6n7g-python3-3.8.12/lib/python3.8', '/nix/store/ksv01pa19hgnpyni4qvc90bq5y0y6n7g-python3-3.8.12/lib/python3.8/lib-dynload']

I [nix-shell:~/scratch]$ python -c "import sys; print(sys.path)"
['', '/nix/store/1cc2qcz3p1sisss7a0w0b82w8zki6cv1-python3.8-tohil-4.4.2/lib/python3.8/site-packages', '/nix/store/ksv01pa19hgnpyni4qvc90bq5y0y6n7g-python3-3.8.12/lib/python3.8/site-packages', '/nix/store/ksv01pa19hgnpyni4qvc90bq5y0y6n7g-python3-3.8.12/lib/python38.zip', '/nix/store/ksv01pa19hgnpyni4qvc90bq5y0y6n7g-python3-3.8.12/lib/python3.8', '/nix/store/ksv01pa19hgnpyni4qvc90bq5y0y6n7g-python3-3.8.12/lib/python3.8/lib-dynload']

Note the presence of '' in the Python example, which tells the Python import machinery to look in the present directory for modules. This will instead be a path to a Python script's parent directory if you run one.

It might be worth emulating this behavior in tohil, but for the time being you can resolve your issue by manually prepending sys.path with '' before attempting the import.