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trying to run outside exe file from python freezes

I'm trying to run an executable file called CDQ.exe (which is supposed to create a text file) from within a python script. I'm using os.system(CDQ.exe) to run it. When I start the python script, the program freezes upon the os.system() call. I also don't get the text file. When I opened the task manager, I found CDQ was still running, and it kept running until I ended it.
When I try to run the CDQ.exe from the windows file browser by clicking it twice, the program appears for a couple of seconds in the task manager, then it closes, and my text file appears.
The executable file was created from c++ qt, and I'm using windows.
Does anyone know what's going on?

Open another process in another Window

In my code I would like to launch a function/script in another python window (say, when you run one script, a back window pops up, I want that script to manage other scripts. They don't need to communicate).
Similar to multiprocessing but they have their own pop up windows and outputs. All their information is going to be written to a file there after.
I have searched a fair amount but it seems like no one want a script to run another script in another window, potentially running 4 or 5 python windows consecutively, each using a separate core.

You should be able to use os.startfile(filename) Here is an example that runs another python file:
import os
os.startfile("File.py")
print("Started Running!")
This will open and run another python program, allowing this program to continue running.

How to free Ubuntu memory once python script is stopped from terminal (Ctrl-C)?

I was calling a python script (2.7) from a console (Ubuntu 14.04) using a command: python script_name.py. At some point, I wanted to stop the running script by pressing Ctrl-C. However, when I checked Ubuntu System Monitor, the memory used by the python script was not freed up (I monitored Ubuntu System Monitor before I called the script, during the process, and after I pressed Ctrl-C to stop the script). I tried to free up the memory using a command explained on http://www.upubuntu.com/2013/01/how-to-free-up-unused-memory-in.html , but didn't work (I mean, the memory usage was not changed).
However, if I used pycharm to run and stop the script, the memory was freed up directly once I pressed the Stop button. For some reasons (such as from ssh or just to test from console), I want to run my script from the console (without using pycharm or any other IDEs).
My question is, what is the command, or how to stop running python script and free up directly the memory used by the script, if I run the script from the console?
Many thanks in advance.

Those commands did not work since what you're trying to achieve is not what they do. How did you check the memory being used by your Python script. I use top to see memory and could used by each process (sorted in ascending order by default). You may have checked before the system had time to register that the python process was killed, I've used this a lot and I've never tun into with the OS not getting memory back after a process has been killed with ctrl + c.
Pycharm is probably doing some cleanup when you stop the program from it versus just having to wait for the OS to reclaim memory versys when you SIGTERM a process from a shell

how to identify jobs running background on Windows 7-10？

I want to run a Python process in background, and I use the following command in PowerShell.
powershell > PowerShell.exe -windowstyle hidden python my_process.py
But, How can I know whether it is running in background? The task manager can not show a process named python my_process.py that running in background, and I don't know the process id on task manager, it just show some python and powershell processes running in background. I can not identify which process is my Python process.

Not actually a programming question, but:
In Task Manager's Process page, choose View > Select Columns and add the Command Line column. Then you can see the actual command line for each process and you should be able to track down the ones you're interested in.
This is for Windows 7; I know they made some changes to the Task Manager for Windows 10 but don't have access to a Windows 10 machine at the moment.

How to attach to PyCharm debugger when executing python script from bash?

I know how to set-up run configurations to pass parameters to a specific python script. There are several entry points, I don't want a run configuration for each one do I? What I want to do instead is launch a python script from a command line shell script and be able to attach the PyCharm debugger to the python script that is executed and have it stop at break points. I've tried to use a pre-launch condition of a utility python script that will sleep for 10 seconds so I can attempt to "attach to process" of the python script. That didn't work. I tried to import pdb and settrace to see if that would stop it for attaching to the process, but that looks to be command line debugging specific only. Any clues would be appreciated.
Thanks!

You can attach the debugger to a python process launched from terminal:
Use Menu Tools --> Attach to process then select python process to debug.
If you want to debug a file installed in site-packages you may need to open the file from its original location.
You can to pause the program manually from debugger and inspect the suspended Thread to find your source file.