python之异常传递_python 多层except传递 异常向上传递

python之异常传递

1. try嵌套

try:
    with open("123.txt") as f:
        content = f.read()
        try:
            content[0] = "a"
        except FileNotFoundError:
            print("文件未发现错误")
except BaseException as error:
    print("出现异常:%s" % error)
1
2
3
4
5
6
7
8
9

• try嵌套时, 如果内层try无法捕获该异常,就会向外层try进行传递

2. 函数嵌套

def func1():
    print("----func1-1----")  
    print(num)
    print("----func1-2----")


def func2():
    try:
        print("----func2-1----")  
        func1()
        print("----func2-2----")

    except:
        print("test2出现异常")  

    print("----func2-3----")  


func2()
print("------华丽的分割线-----")
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

• 函数嵌套时, 如果内层函数无法捕获该异常, 就会向外层函数进行传递