关于python:python中上下文管理with用法

#!/usr/bin/env python# -*- coding: utf-8 -*-import queueq=queue.Queue()q.put(1)li=[]# li.append(1)# print(li)# q.get()# li.remove(1)# print(li)import  contextlib@contextlib.contextmanagerdef 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 -*-import  contextlibimport queue@contextlib.contextmanagerdef work_state(xxx,val):    xxx.append(val)    aaa = 123456789try:yield aaafinally:        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

123456789

Process finished with exit code 0

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