Use your imagination. Sometimes the machines are not set up and maintained by you. Sometimes you write scripts and run them far away. Sometimes someone else's script mucks with PATH. Now there is an ambiguity about which python runs.
Ask folks who ran into this with an old release installed by default, as in a Mac. Some of them appear to be on the thread.
Ask folks who ran into this with an old release installed by default, as in a Mac. Some of them appear to be on the thread.