Ensure pip always runs in a virtual environment If you set the environment variable PIP_REQUIRE_VIRTUALENV to true, pip will refuse to install anything outside a virtual environment. Forgetting to activate a venv can be very annoying as it will install all sorts of things outside virtual environments over time, possibly leading to further errors. So, you may want to add this to your .bashrc or .zshrc and re-start your shell:
export PIP_REQUIRE_VIRTUALENV=true
Age: = round((date(now) - this.file.ctime).days) days