os. _exit of and sys. exit of exit of 0 and exit of 1

os. _exit() and sys. exit(), exit(0) and exit(1)

os. _exit () and sys exit ()

os._exit() vs sys.exit()

An overview of the

Python has two exits: os. _exit() and sys. exit(). This article introduces the differences and choices between the two approaches.

os. _exit() terminates the python program directly and all subsequent code will not continue to execute.

sys. exit() throws an exception: SystemExit, and if the exception is not caught, the python interpreter exits. If there is code to catch this exception, it will still execute. Catching this exception does a little extra cleanup. 0 is normal exit, other values (1-127) are abnormal, and abnormal events can be thrown for capture.

For example

#!/usr/local/bin/env python
import os, sys

try:
  sys.exit(0)
except:
  print('die')
finally:
  print('cleanup')

try:
  os._exit(0)
except:
  print('die')
print('os.exit')# Quit without printing 

Output:

die
cleanup

The difference between

To sum up, the exit of sys.exit () is elegant, and the invocation throws an SystemExit exception, which can be caught and cleaned up. os. _exit() simply exits the python interpreter and the remaining statements are not executed.

1 Generally use ES56en. exit(), 1 generally use ES59en. _exit() in the subprocess of fork

os. _exit() is generally used to exit a thread

sys. exit() is used to exit in the main thread.

exit() should be the same as exit() for other languages such as C.
os. _exit() calls the _exit() function of the C language.

builtin. exit is an Quitter object whose call method throws an SystemExit exception.

exit (0) and exit (1)

exit(0) : Exit without error
exit(1) : Exit with error
The exit code tells the interpreter (or the operating system)

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