Python尝试除了最后

发布于 2024-10-07 22:00:37 字数 759 浏览 0 评论 0原文

看来我还不太掌握异常处理的窍门。我不知所措:( 以下代码有时会返回此错误：

File "applications/pingback/modules/plugin_h_pingback.py", line 190, in ping
    db(table.id==id_).update(status=status)
UnboundLocalError: local variable 'status' referenced before assignment

我希望 status 始终已被分配一个值。难道是抛出了其他异常（可能是在内部的 try 中）并且finally 掩盖了它？

...
try:
    server_url = self._get_pingback_server(target)
except PingbackClientError, e:
    status = e.message
else:
    try:
        server = xmlrpclib.ServerProxy(server_url)
        status = server.pingback.ping(self.source, target)
    except xmlrpclib.Fault, e:
        status = e
finally:
    db(table.id==id_).update(status=status) # <-- UnboundLocalError
...

谢谢，HC

原文

It looks like I don't quite have the hang of Exception handling yet. I'm at a loss :(
The following code sometimes returns this error:

File "applications/pingback/modules/plugin_h_pingback.py", line 190, in ping
    db(table.id==id_).update(status=status)
UnboundLocalError: local variable 'status' referenced before assignment

I would expect status to always have been assigned a value. Could it be that some other exception is thrown (perhaps in the inner try) and the finally obscures it?

...
try:
    server_url = self._get_pingback_server(target)
except PingbackClientError, e:
    status = e.message
else:
    try:
        server = xmlrpclib.ServerProxy(server_url)
        status = server.pingback.ping(self.source, target)
    except xmlrpclib.Fault, e:
        status = e
finally:
    db(table.id==id_).update(status=status) # <-- UnboundLocalError
...

Thanks, HC

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别念他 2024-10-14 22:00:37

您的代码并不总是为状态分配某些内容。我可以看到几种可能无法分配状态的方法，我在下面突出显示了它们：

try:
    server_url = self._get_pingback_server(target)
except PingbackClientError, e:
    # If evaluating `e.message` raises an exception then status is not set.
    status = e.message  # <--- here
else:
    try:
        # If either of these two lines fails with something other than
        # xmlrcplib.Fault, then status is not set.
        server = xmlrpclib.ServerProxy(server_url)             # <--- here
        status = server.pingback.ping(self.source, target)     # <--- here
    # If xmlrpclib.Fault is not defined status is not set.
    except xmlrpclib.Fault, e:                                 # <--- here
        status = e
finally:
    db(table.id==id_).update(status=status)

我怀疑最有可能出现错误的位置是在内部 try 块中，您只能在其中捕获 xmlrpclib.Fault 而不是其他类型的异常。

Your code doesn't always assign something to status. I can see a few ways that status might not be assigned and I've highlighted them below:

try:
    server_url = self._get_pingback_server(target)
except PingbackClientError, e:
    # If evaluating `e.message` raises an exception then status is not set.
    status = e.message  # <--- here
else:
    try:
        # If either of these two lines fails with something other than
        # xmlrcplib.Fault, then status is not set.
        server = xmlrpclib.ServerProxy(server_url)             # <--- here
        status = server.pingback.ping(self.source, target)     # <--- here
    # If xmlrpclib.Fault is not defined status is not set.
    except xmlrpclib.Fault, e:                                 # <--- here
        status = e
finally:
    db(table.id==id_).update(status=status)

I suspect that the most likely place for the error is in the inner try block where you are only catching xmlrpclib.Fault and not other types of exceptions.

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