pythonコンテキストマネージャのContextManagementの2つの実装方法
713 ワード
from contextlib import contextmanager
@contextmanager
def my_open(path,mode):
f=open(path,mode)
yield f #myopen
f.close()#
with my_open('out.txt','w') as f:
f.write("hello,the simplest context manage")
class File(object):
def __init__(self,filePath,mode):
f = open(filePath,mode)
self.f = f
def __enter__(self):
print('enter')
return self.f
def __exit__(self, exc_type, exc_val, exc_tb):
print('exit')
self.f.close()
with File('out.txt','w') as f:
f.write('context manage')
enterを先に実行してexitを実行