ModuleNotFoundError: No module named ''

Dear all,
To use lascar module, in my jupyter notebook, I typed

git clone
cd lascar
  Then I found that the execution of the following line
python3 develop

would take too much time; thus I type this line in my command line terminal.
Then I restart the kernel; I execute the following lines in jupyter notebook,

from lascar import *
from import sbox, inv_sbox

I got an error message as:
ModuleNotFoundError: No module named ‘’


If you remove the from import sbox, inv_sbox line, does the command succeed?