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Please help me in clarifying the concept of these two python statements in terms of difference in functionality:
sys.exit(0)
os._exit(0)
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_exit() method in Python is used to exit the process with specified status without calling cleanup handlers, flushing stdio buffers, etc. Note: This method is normally used in child process after os. fork() system call. The standard way to exit the process is sys.
exit is a helper for the interactive shell - sys. exit is intended for use in programs. The site module (which is imported automatically during startup, except if the -S command-line option is given) adds several constants to the built-in namespace (e.g. exit ).
exit is generally used in programs to raise the SystemExit Exception. With this exception, the program is closed with a proper code passed into the argument.
exit(0) means a clean exit without any errors / problems. exit(1) means there was some issue / error / problem and that is why the program is exiting. This is not Python specific and is pretty common. A non-zero exit code is treated as an abnormal exit, and at times, the error code indicates what the problem was.
According to the documentation:
os._exit():Exit the process with status n, without calling cleanup handlers, flushing stdio buffers, etc.
Note The standard way to exit is
sys.exit(n)._exit()should normally only be used in the child process after afork().
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