I once shipped a python script with a dependency on the requests package, and installing that on the customer's system caused an outage on their production serv

I once shipped a python script with a dependency on the requests package, and installing that on the customer's system caused an outage on their production server with 1000s of users because of a permissions issue, that wasn't present in their and my test systems. So, no more "use the system python" for me...