Python 3 subprocess module throws error running “dir” on Windows

Question

This simple program in Python 3 throws errors. What could be the reason? This problem arose after I installed/reinstalled Python 3.5/3.6. Also

Answer 1

It's not an executable, but built-in to the shell. Python subprocess module can't find it, so you got an error.

If you would like to play with subprocess module, use some existing binary, e.g. python, notepad or ping. In case you need to list folder content, please use os.listdir or os.walk.