Two examples of launching an application and quitting it using `NSRunningApplication.terminate()`

launch_quit_xcode.py

#!/usr/bin/python

import AppKit

from time import sleep
from Foundation import NSURL

xcode_url = NSURL.fileURLWithPath_isDirectory_('/Applications/Xcode.app', True)

workspace = AppKit.NSWorkspace.sharedWorkspace()
workspace.launchApplicationAtURL_options_configuration_error_(xcode_url, AppKit.NSWorkspaceLaunchDefault, {}, None)

# Sleeping to just give it time to launch
sleep(10)

# naively assume that we get at least one result back from `runningApplicationsWithBundleIdentifier`
running_xcode = AppKit.NSRunningApplication.runningApplicationsWithBundleIdentifier_('com.apple.dt.Xcode')[0]
running_xcode.terminate()

Popen_quit_by_pid.py

#!/usr/bin/python

# Alternate example using subprocess.Popen and finding the NSRunningApplication by PID

import AppKit

from time import sleep
from Foundation import NSURL

proc = subprocess.Popen(['/Applications/Xcode.app/Contents/MacOS/Xcode'])

# Sleeping to just give it time to launch
sleep(10)

# Find the running app by the pid we got from Popen()
running_xcode = NSRunningApplication.runningApplicationWithProcessIdentifier_(proc.pid)
running_xcode.terminate()