How to end exit python script

How to end and exit the python script: 1. Use "sys.exit()" to exit the program directly, which will cause a SystemExit exception; 2. Use "os._exit()" to exit directly, but not An exception will be thrown; 3. Use "os.kill()" to directly kill the process. It is only valid on UNIX platforms.

Python itself provides several methods for how to end a Python program or use Python operations to end a process, and these methods also exist. Some differences, I have read and practiced several related methods, and also recorded them.

Reference method:

1. sys.exit()

Executing this statement will directly exit the program. This is also a frequently used method. There is no need to consider the influence of factors such as platform. It is generally the preferred method to exit a Python program. This method contains a parameter status, which defaults to 0, indicating a normal exit, or 1, indicating an abnormal exit.

This method raises a SystemExit exception (this is the only exception that is not considered an error). If this exception is not set to be caught, the program will exit directly. , of course, you can also catch this exception and perform some other operations.

2. os._exit()

The effect is to exit directly without throwing an exception, but its use will be restricted by the platform, but we commonly use Win32 Platforms and UNIX-based platforms are not affected.

3. os.kill()

is generally used to kill the process directly, but it is only effective on UNIX platforms.

Basic principle: This function simulates the traditional UNIX function to send a signal to the process, which contains two parameters: one is the process name, that is, the process to receive the signal; the other is the operation to be performed.

Common values for operation (second parameter) are:

SIGINT terminates the process and interrupts the process

SIGTERM terminates the process software termination signal

SIGKILL terminates Process Kill Process

SIGALRM Alarm Clock Signal

Example: Open the VLC video player on the Linux platform, and then view the running process: the process number is 4497

Then execute the os.kill operation:

After the execution, you can find that the VLC video player has been closed and the process has also been killed.

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