Error : psutil.NoSuchProcess: Process no longer exists (pid=23100)

Question

I have this code for getting PIDs for specific processes; the code is running well, but sometimes I get this error:

psutil.NoSuchProcess: Process no longer exists (pid=xxxx)

How can this problem be solved? And how can I restart the script if this error or other errors happened?

import psutil

my_pid = None
pids = psutil.pids()
for pid in pids:
    ps = psutil.Process(pid)
    # find process by .exe name, but note that there might be more instances of solitaire.exe
    if "solitaire.exe" in ps.name():
        my_pid = ps.pid
        print( "%s running with pid: %d" % (ps.name(), ps.pid) )

Asked By: Mr Diga

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Source

Answer 1

The problem is that between discovering the pid (process ID) of a given program and the loop getting to the point where it attempts to inspect it, that process has already stopped running.

You can work around it by using try / except:

for pid in pids:
    try:
        ps = psutil.Process(pid)
        name = ps.name()
    except psutil.NoSuchProcess:  # Catch the error caused by the process no longer existing
        pass  # Ignore it
    else:
        if "solitaire.exe" in name:
            print(f"{name} running with pid: {pid}")

There’s no need to use ps.pid – it will have the same value as the pid you used to initialize the Process object. Additionally, f-strings (available in Python 3.7+) are easier to read/maintain, and they provide a more modern way to apply string formatting.

Answered By: dskrypa

Error : psutil.NoSuchProcess: Process no longer exists (pid=23100)

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