I am using Python3.9 on Windows machine. I created a virtual environment (my_venv) and activated it. cd to the my_venv folder and then did pip3 install quandl if I then run pip3 list I can see Quandl3.7.0 in the list.
making sure I am in the my_venv directory I then run Jupyter Notebook and it launches and says the kernel is called python3 (which is the only kernel available). When I then run import quandl I get "No Module named 'quandl'"
Note: I have tried the import with and without a capital Q and in both cases it gives the same error.