学习笔记(18):21天通关Python（仅视频课）-管道输入与with语句
立即学习:https://edu.csdn.net/course/play/24797/282198?utm_source=blogtoedu
# import sys
# for i in sys.stdin:
# print(i)
class TestWith:
def __init__(self, tag):
self.tag = tag
print('构造函数——init——')
def __enter__(self):
print('运行__enter__方法tag=%s' % self.tag)
return '返回enter方法结果'
'''
异常信息
exc_type:异常类型
exc_val：异常传入的value
exc_tb：异常的traceback
'''
def __exit__(self, exc_type, exc_val, exc_tb):
if exc_tb:
print('此处有异常')
else:
print('程序运行正常')
with TestWith('testWith') as re:
print('re:%s' % re)
print('开始')
# raise Exception(2, '错误')
print('结束')
with open('test45.py', 'r', True, 'utf-8') as f:
for i in f:
print(i, end='')
作者：Hello-Rock
