@inlovewithpda Oops, sorry, I wasn't clear. The first set of instructions should be two lines. So:
python3 -m venv venv-dir
And then:
source venv-dir/bin/activate
Entering it all on one line has probably also created a "source" directory, which you can delete (as long as you didn't already have anything in such a directory).
@semiprime Could not build wheels for pycairo