I have python script that interacts with other windows program. Occasionally this program crashes and I get an error in script. How can I shut down this program and restart it again?
This code works for me
import subprocess
subprocess.call(["taskkill", "/F", "/T", "/IM", "progname.exe"]) # forced killing, with childs, by name
subprocess.Popen([r"C:\Path\To\Folder\progname.exe", "--fast"])
How do I write to logs, close files etc. when my python program gets killed by a system shutdown? The program is a long running process which uses a while True loop i.e.
while True:
# Open files
#do long running process
If the system is shutdown while this is running, can it get a signal so that it knows to cleanup e.g. close files, write "shutting down..." to log etc. What would the code look like to handle this?
Code is Python 3 running on Debian Wheezy. Program will be started by an init script on system start up.
Thanks.
Is it possible to somehow quit Python IDLE under Windows from within my python code/script at the end after running?
I tried something like:
import sys
sys.exit(0) # or exit(1)
didn't work. Probably only quits the current "process" of the running python script.
Thanks a lot
If you can run IDLE from the command line (or edit your shortcut), I found this in the IDLE help.
If IDLE is started with the -n command line switch it will run in a
single process and will not create the subprocess which runs the RPC
Python execution server.
Which seems to imply that the script is running inside IDLE. I did a quick test script, and calling exit() brought up a box asking to kill the program. Clicked yes, and the script and IDLE both quit. Hope that can help.
This will do exactly what you want. No prompt.
import os
os.system("taskkill /f /im pythonw.exe")
To quit Python IDLE under Windows from within a python code/script without a further prompt, try:
parent_pid = os.getppid() # Get parent's process id
parent_process = None
for proc in psutil.process_iter(attrs=['pid']): # Check all processes
if proc.pid == parent_pid: # Parent's Process class
parent_process = proc
break
if parent_process is not None:
parent_process.kill() # Kill the parent's process
This works with IDLE, PyCharm and even the command line in Windows.
I wrote a program in IDLE to tokenize text files and it starts to tokeniza 349 text files! How can I stop it? How can I stop a running Python program?
You can also do it if you use the exit() function in your code. More ideally, you can do sys.exit(). sys.exit() which might terminate Python even if you are running things in parallel through the multiprocessing package.
Note: In order to use the sys.exit(), you must import it: import sys
To stop your program, just press Control + C.
If your program is running at an interactive console, pressing CTRL + C will raise a KeyboardInterrupt exception on the main thread.
If your Python program doesn't catch it, the KeyboardInterrupt will cause Python to exit. However, an except KeyboardInterrupt: block, or something like a bare except:, will prevent this mechanism from actually stopping the script from running.
Sometimes if KeyboardInterrupt is not working you can send a SIGBREAK signal instead; on Windows, CTRL + Pause/Break may be handled by the interpreter without generating a catchable KeyboardInterrupt exception.
However, these mechanisms mainly only work if the Python interpreter is running and responding to operating system events. If the Python interpreter is not responding for some reason, the most effective way is to terminate the entire operating system process that is running the interpreter. The mechanism for this varies by operating system.
In a Unix-style shell environment, you can press CTRL + Z to suspend whatever process is currently controlling the console. Once you get the shell prompt back, you can use jobs to list suspended jobs, and you can kill the first suspended job with kill %1. (If you want to start it running again, you can continue the job in the foreground by using fg %1; read your shell's manual on job control for more information.)
Alternatively, in a Unix or Unix-like environment, you can find the Python process's PID (process identifier) and kill it by PID. Use something like ps aux | grep python to find which Python processes are running, and then use kill <pid> to send a SIGTERM signal.
The kill command on Unix sends SIGTERM by default, and a Python program can install a signal handler for SIGTERM using the signal module. In theory, any signal handler for SIGTERM should shut down the process gracefully. But sometimes if the process is stuck (for example, blocked in an uninterruptable IO sleep state), a SIGTERM signal has no effect because the process can't even wake up to handle it.
To forcibly kill a process that isn't responding to signals, you need to send the SIGKILL signal, sometimes referred to as kill -9 because 9 is the numeric value of the SIGKILL constant. From the command line, you can use kill -KILL <pid> (or kill -9 <pid> for short) to send a SIGKILL and stop the process running immediately.
On Windows, you don't have the Unix system of process signals, but you can forcibly terminate a running process by using the TerminateProcess function. Interactively, the easiest way to do this is to open Task Manager, find the python.exe process that corresponds to your program, and click the "End Process" button. You can also use the taskkill command for similar purposes.
To stop a python script just press Ctrl + C.
Inside a script with exit(), you can do it.
You can do it in an interactive script with just exit.
You can use pkill -f name-of-the-python-script.
To stop a python script using the keyboard: Ctrl + C
To stop it using code (This has worked for me on Python 3) :
import os
os._exit(0)
you can also use:
import sys
sys.exit()
or:
exit()
or:
raise SystemExit
To stop a running program, use Ctrl+C to terminate the process.
To handle it programmatically in python, import the sys module and use sys.exit() where you want to terminate the program.
import sys
sys.exit()
Ctrl-Break it is more powerful than Ctrl-C
When I have a python script running on a linux terminal, CTRL+\ works. (not CRTL + C or D)
Ctrl+Z should do it, if you're caught in the python shell. Keep in mind that instances of the script could continue running in background, so under linux you have to kill the corresponding process.
exit() will kill the Kernel if you're in Jupyter Notebook so it's not a good idea. raise command will stop the program.
To stop your program, just press CTRL + D
or exit().
you can also use the Activity Monitor to stop the py process
Control+D works for me on Windows 10. Also, putting exit() at the end also works.
Windows solution: Control + C.
Macbook solution: Control (^) + C.
Another way is to open a terminal, type top, write down the PID of the process that you would like to kill and then type on the terminal: kill -9 <pid>
If you are working with Spyder, use CTRL+. and you will restart the kernel, also you will stop the program.
Try using:
Ctrl + Fn + S
or
Ctrl + Fn + B
Press Ctrl+Alt+Delete and Task Manager will pop up. Find the Python command running, right click on it and and click Stop or Kill.
If you are writing a script to process 349 files, but want to test with fewer, just write a nonexisting word like 'stop' in your list, which will cause a stop in the form of an exception. This avoids dialogs like do you want to kill your process if you use exit() or quit()
I know that the way to terminate a Python script is with raise SystemExit or with sys.exit() which is the same eventually.
However when I run it in Eclipse-Pydev (Ctrl+F11) and I exit from it, the program seems to be exiting, all windows are disappearing, put the Python process is still there in the task manager. The Terminate and Terminate All buttons remain active in Eclipse too. Pressing one of those kills it properly.
My script is terminating just fine if it has been run from the windows command prompt.
What could be the problem here?