Python implementation ensures that only one script instance can be run, and python implementation script instance

Python implementation ensures that only one script instance can be run, and python implementation script instance

Ensure that only one script instance can be run by listening to a specific port when the program is running. If the port fails, an instance is running.

Implemented With a decorator to facilitate reuse
Copy codeThe Code is as follows:
Import functools
Def just_one_instance (func ):

'''

Decorator

Exit if an instance is running.
Copy codeThe Code is as follows:
: Return:

'''
@ Functools. wraps (func)
Def f (* args, ** kwargs ):
Import socket
Try:
# Global attribute. Otherwise, the variable will be destroyed after the method exits.
Global s
S = socket. socket ()
Host = socket. gethostname ()
S. bind (host, 60123 ))
Except t:
Print ('already has an instance ')
Return None
Return func (* args, ** kwargs)
Return f
[Code]
Use the following in the main function of the script:
[Code]
@ Just_one_instance
Main ():
Do something.