Python异常处理

1.try…except…else

try:
    fn = open("aa.txt","r")
    fn.write("这是一个测试文件")
except Exception as e:
    print "错误提示",e.message
else:
    print "写入内容成功"
    fn.close()

2.try…finally

try:
    fn = open("aa.txt","r")
    fn.write("这是一个测试文件")
except Exception as e:
    print "错误提示",e.message
finally:
    print "我都会执行"
    fn.close()