Issue with Subprocess Module (UPDATED)

So, when I'm developing scripts I usually test in a python shell through the terminal. I've recently encountered and issue wherein every time I attempt to run a command through subprocess it freezes the shell. Any suggestions? I will provide screenshots when I have time.

UPDATE: I was using the subprocess module on another system running Fedora live and it froze as well, Kali 2.0 is probably not the issue.

-Defalt