How to use 'python launcher' in Python

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18def python_switcher(python_exec: str, python_file: str, args: list):
19 '''
20 Switch to the right python
21 '''
22 if not os.getpid() - os.getppid() == 1:
23 subprocess.call(['%s %s %s' % (python_exec, python_file, ' '.join(args))], shell=True)
24 else:
25 sys.exit(1)
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