In addition to the issues other people have mentioned, Python benefits from a large standard library in a way that Rust doesn't, because Python scripts don't require a build step.
So it's easier to use Python than Rust for a little bit of "glue" in a place where maintaining a pile of dependencies would be inconvenient.
If you can just stick a single .py file in a git repo somewhere and arrange for it to be run, that's a big gain compared to having to maintain a list of dependencies and arrange for them to be installed and so on. So it makes a big difference that you have access to regular expressions and tar files and whatever in that situation.
So it's easier to use Python than Rust for a little bit of "glue" in a place where maintaining a pile of dependencies would be inconvenient.
If you can just stick a single .py file in a git repo somewhere and arrange for it to be run, that's a big gain compared to having to maintain a list of dependencies and arrange for them to be installed and so on. So it makes a big difference that you have access to regular expressions and tar files and whatever in that situation.