Activate virtual environment (Assumes ./venv/bin/activate as activator)

cd.sh

 cd(){
     venvactifile=./venv/bin/activate
     builtin cd "$@";
     if [ -e "$venvactifile" ]; then
         source $venvactifile
         export PYTHONPATH=$(pwd)
         echo "IN LIKE FLYNN"
     else
         if type deactivate >/dev/null 2>&1
         then
             deactivate
             echo "Leaving Environment"
         fi
     fi
 }