如果发生任何异常，就执行一些操作

Question

我需要执行代码，只有当任何异常发生。 我尝试使用以下代码：

args = [1, 2, 3]
# .... some code ....
exception_happened = True
try:
    out = zabbix_get(ip='127.0.0.1')
except OSError as e:
    logger.critical("Error {0}: {1}".format(e.errno, e.strerror))
except subprocess.CalledProcessError as e:
    logger.critical("Subprocess exit with 1")
else:
    exception_happened = False
finally:
    if exception_happened:
        # .... this code for execute if any exeptions happend...

也许有更好的解决方案？你知道吗

Answer 1

您需要添加except Exception块来捕获以前未列出的常规异常：

...
except OSError as e:
    exception_happened = True
    logger.critical("Error {0}: {1}".format(e.errno, e.strerror))
except subprocess.CalledProcessError as e:
    exception_happened = True
    logger.critical("Subprocess exit with 1")
except Exception as e:
    # any other exception will land here
    ...

finally的用法是pretty different use case。你知道吗

[更新]正如评论中指出的，也许这就是你想要的：

try:
    ...
except Exception as e:
    if isinstance(e, ValueError):
        # do something
    elif ...

Answer 2

正如我在评论中说的，也许你想做：

def exception_function():
    #do whatever you want

然后在异常块中调用它：

try:
    out = zabbix_get(ip='127.0.0.1')
except OSError as e:
    exception_function()
    logger.critical("Error {0}: {1}".format(e.errno, e.strerror))
except subprocess.CalledProcessError as e:
    exception_function()
    logger.critical("Subprocess exit with 1")

防止做最后和另一个条件测试。你知道吗