[odie5533]

If you're just writing tiny scripts for yourself, sure use the system Python.

If you're doing work on a large Python app for production software, then using system Python isn't going to cut it.

[mixmastamyk]

This is a restatement of my post with a restriction to tiny scripts. I don't restrict myself to _tiny_ scripts, some of my libraries are substantial.

Keeping the number of dependencies reasonable is probably the most important factor, rather than lines of code.