# with open('/tmp/passwd') as f:
# print(f.read())
class Myopen(object):
def __init__(self, name, mode='r'):
self.name = name
self.mode = mode
def __enter__(self):
# 当with语句进入并开始执行时,执行的内容,需要返回一个对象,在执行结束之后用来关闭或者其他操作;
self.f = open(self.name, self.mode)
print("正在打开文件%s......" %(self.name))
return self.f
def __exit__(self, exc_type, exc_val, exc_tb):
# 当with语句执行结束后, 做什么操作
self.f.close()
print("文件正在关闭..........")
with Myopen('/tmp/passwd') as f:
print(f.read())
with语句之安全上下文管理
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转载自blog.csdn.net/dodobibibi/article/details/87262942
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