python中上下文管理with用法 python

#!/usr/bin/env python # -*- coding: utf-8 -*- import queue q=queue.Queue() q.put(1) li=[]# li.append(1) # print(li) # q.get() # li.remove(1) # print(li)importcontextlib @contextlib.contextmanager def work_state(li,val): li.append(val) print(li) try: yield finally: li.remove(val) print(li)with work_state(li,1): q.get()

C:\Python31\python.exe D:/pythoncode/a6.py
[1]
[]
Process finished with exit code 0

#!/usr/bin/env python # -*- coding: utf-8 -*- importcontextlib import queue@contextlib.contextmanager def work_state(xxx,val): xxx.append(val) aaa = 123456789 try: yield aaa finally: xxx.remove(val)q = queue.Queue() q.put("sl")li = []with work_state(li,1) as f: print(f) q.get()

C:\Python31\python.exe D:/pythoncode/a7.py
【python中上下文管理with用法】123456789
Process finished with exit code 0
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