tox run python command in sudo

Question

When I try to run a test command using sudo python ..., tox uses the system Python instead of the tox-specified version. How can I run commands in sudo using tox?

commands =
    sudo python -m pytest  # always runs system python!

Answer 1

python in Tox commands will only be replaced if it is a command. Technically, sudo python ... will run the system command sudo and pass it "python" as the first argument.

Tox provides a number of substitutions that allow for a lot of flexibility. In your case, you'll want something like

commands =
    sudo {envpython} -m pytest  # always uses the right python :)