Auto activate and deactivate python venv using zsh (and fish)

When I found out about python venv (apt-get install python3-venv) I became an instant addict. It's clean, it's built-in and it's explicit.

Now every time I create a new project folder I automatically run python3 -mvenv venv && source ./venv/bin/activate.

But typing ./venv/bin/activate and then deactivate is too much work for my lazy programmer head.

So I decided to finally invest 10 minutes to free me from activating and deactivating python's env every time I enter or leave a folder with my standard ./venv folder:

#---------------------------------------------- chpwd pyvenv --- python_venv() { MYVENV=./venv # when you cd into a folder that contains $MYVENV [[ -d $MYVENV ]] && source $MYVENV/bin/activate > /dev/null 2>&1 # when you cd into a folder that doesn't [[ ! -d $MYVENV ]] && deactivate > /dev/null 2>&1 } autoload -U add-zsh-hook add-zsh-hook chpwd python_venv python_venv 

edit: just figured out that deactivating was working because of other stuff installed in my shell. Now it's a bit more agressive but works 100%

edit2: been trying out fish shell. Here it is translated to fish script:

function python_venv --on-variable PWD set myvenv ./venv if test -d $myvenv source $myvenv/bin/activate.fish else if type -q deactivate deactivate end end