try exception关于异常捕获多重使用_try except 多重

try exception finally 函数内部异常

msg = ""
def test():
    try:
        raise Exception("文件解压失败")
    except NameError:
        pass
    try:
        print("test")
    except Exception:
        pass


def main():
    try:
        test()
        print("main")
    except Exception:
        print("not now")

main() 
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函数内部未捕获异常异常被外层异常捕获，且函数内部代码不继续执行。

PS F:\workspace\Template> python .\try.py
not now
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函数内部异常被捕获则不会再被捕获

def test():
    try:
        raise Exception("文件解压失败")
    except Exception:
        pass
    try:
        print("test")
    except Exception:
        pass


def main():
    try:
        test()
        print("main")
    except Exception:
        print("not now")

main() 
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代码异常被捕获且继续执行

PS F:\workspace\Template> python .\try.py
test
main
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异常捕获嵌套

异常被捕获则不影响代码继续执行，且外层不捕获异常，但是try内部代码触发异常以后不再继续执行

def test():
    try:
        try:
            print("in1")
            raise Exception("文件解压失败")
        except Exception:
            pass
        print("in2")
    except Exception:
        print("out")
test()
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PS F:\workspace\Template> python .\try.py
in1
in2
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def test():
    try:
        try:
            print("in1")
            raise NameError("文件解压失败")
            print("try in2")
        except Exception:
            raise NameError()
            pass
        print("in2")
    except Exception:
        print("out")
test()
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PS F:\workspace\Template> python .\try.py
in1
out
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本质上触发异常就不继续运行 ，所以尽量将try写的细点。