psutil returns 0.0 for process.create_time()

I’m struggling to understand this block of code:

The name of the user who started the process

There are several running processes with the same name, (for example: notepad.exe) and there is a PID of these processes .

psutil.disk_usage throws an exception – argument 1 (impossible)

trying to use the disk_usage, following the documentation throws me an error..