What you're talking about already exists, in mutltiple forms actually.
RDP: You're probably already aware of Remote Desktop Clients which should be sufficient enough. If you're really inclined on launching apps via command line, you can just open up terminal and do it remotely.
SSH: You can set up a secure shell server on both devices and launch a connection over the LAN. There are multiple clients that I know of on dos systems such as PuTTY or WinSCP. On UNIX systems, there is an SSH shell which you can use for remote connections on either ends. However everything you do will be command-line so you should already have a knowledge of the file system structure and how to navigate it and actually use it.
If you are looking for a script on iOS, I've had very little experience with developing in Python and I don't even know if it can pull off what you are asking. iOS 7.X >= compiles in Objective-C, iOS 8.X compiles in Swift, and the upcoming iOS 9 will be compiling in Swift 2.