如何退出嵌套的python脚本？

Question

I have two python scripts call a.py and b.py .

From inside a.py , I am giving command

os.system('python b.py')

If some exception is found in b.py , I want the complete execution of both a.py and b.py to be halted. Is there a way to do that?

I am not importing b.py in a.py . I am simply calling it using os.system() .

How can the same be achieved even if I import the other script?

Answer 1

os.system() returns the (encoded) process exit value. 0 means success.

I would rather reccomend the subprocess Module since it is more powerful. Take a look at subprocess.call(args, *, stdin=None, stdout=None, stderr=None, shell=False) .

Good luck.

Answer 2

If you import a module b that might raise an exception which you won't handle, either let the exception halt the execution by not handling it, or, handle it and exit yourself.

If you opt for calling os.system check the error code returned; if Python doesn't exit gracefully (ie an exception was raised) it is going to be a non 0 value. You can test on and act accordingly:

if os.system('python b.py'):
    # exit from script a.by