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Testing the user interface inside a program running on Linux

Are there libraries for automating (using Python) the management of a program run by a user on a Linux operating system?
I need to create tests to test the program interface (pressing buttons, entering text in special fields, reading text from the program window).
UPD:
pywinauto - as I understand it, this library is only suitable for managing Windows applications
UPD2:
The application that needs to be managed works on the basis of Visual Studio, maybe I can somehow connect to it using selenium?

Controlling and automating a child browser window

Suppose I access some applications through a VPN. Let's say a webbrowser like internet explorer is one of these applications. Using python's selenium package I can automate logging in to VPN and opening the internet application inside the VPN. Now the internet explorer window inside VPN opens.
So what I need to know is:
Is there any way by which I can control this new internet explorer through python' selenium package?
Is there any way to automate this child window using any other scripting language like Perl, tcl, vbscript etc?

Yes. Selenium provides methods to control the behavior of a separate child window that is spawned by another browser window. There are methods which allow you to jump into that window, perform some actions and then come back to the parent window that triggered the child window.
Is there any way to automate this child window using any other
scripting language like Perl ,tcl,vbscript etc ?
As mentioned above, Selenium with Python should be good enough to automate the process in child window.
Adding a couple of links that may help you with this
How to handle multiple windows Python Selenium
Handling multiple windows
Link 3

Selenium and Zapier

I currently have some ad-hoc scripts I run using Selenium to automate browser tasks with sites that do not have an API.
I wish to move this to trigger-based running.
One possible way is do this is to build in these triggers to the scripts, so every x min/seconds, it will check and run if necessary. I have a spare computer that will have this constantly running, but I would prefer to not do it this way.
Is there any way to integrate Selenium and Zapier or complete a similar task by using Zapier triggers?
The script is written in Python.

If you are having windows system you can use Task scheduler. If you are having Linux you can use crontab to schedule tasks.
Assuming you may have windows, You can create .bat file to trigger your selenium (say mytask.bat). Execute the mytask.bat using scheduler.
Start->Control Panel->System and Security->Administrative Tools->Task Scheduler
Action->Create Basic Task->Type a name and Click Next
Follow through the wizard as screen shot given below.

How to control a Windows application from Python

I have the application installed on my windows PC, I want to launch that application using python and select dropdown options and do some other activities in that application.
I was able to launch the application using the os.system command, but I am not able to proceed further.
I want my program to do things like:
* select from a dropdown menu
* click on a button
How can my application control the user interface of another application?

Normally, an application exposes a user interface (UI) for users, and an application programming interface (API) for programming.
A human being uses keyboard and mouse to work with the user interface (UI)
An application uses programming to work with the application programming interface (API)
The UI is designed for humans, and the API is designed for computers.
It is sometimes possible to use programming to control the user interface of another program -- so your program acts as if it were using the keyboard and mouse. This technique is often called "UI automation", and programs that do it are sometimes called "robots".
It's a big topic, and it can be quite complex. It's almost always better to use an API instead if you can: it's faster, simpler, more reliable.
If you do need to use UI automation, there are a few different tools that can help.
You are asking about Python, so here are a few UI automation tools that work with Python:
AutoIT is a standalone product, but you can use Python to script it.
PyWinAuto is designed for use from Python.
Sikuli uses computer vision to find parts of the screen. I believe it comes with a recording tool as well.
Just to repeat: UI automation is weird and hard. If you can possibly use an API instead, your life will be much easier.

You need to install pywinauto package
Try the following code to run the .exe file
from pywinauto import application
app = application.Application()
app.start("Notepad.exe")

here you are:
(with os ^_-)
import os
os.startfile('your exe file address')

How do I interact with Windows programs

So I'm trying to create an automatic installer using Python. How would I go about interacting with native Windows applications that I launch? I am currently launching them using subprocess.call. Would I need to use Win32com? IronPython? Call a VB script from Python?
I've been trying to look into COM objects, but all I see are default Microsoft applications.

If the application supports COM, use COM using win32com. This tutorial helped me a lot. If it does not, you can use something like pywinauto or similar software. It is usually described as module for GUI testing. SendKeys comes handy for non-standard GUIs as a last resort.
Ranorex Spy is very helpful tool for identifying GUI elements.
Some of my colleagues also use compiled AutoHotkey scripts.