python - problems handling exception and continuing

Question

I am building or trying to build a python script which check's a list of ip addresses (ips.txt) for a specific program using the wmi python module. However, no matter how I handle the exceptions on assets with no RPC service running the script stops running on an error. I am using python 2.7.5

Can I catch and pass the error's to proceed? Can I catch the error and print or return a note that the ip was not alive or rpc was not running?

Thank you in advance

Here is my code:

import wmi
list = open("ips.txt")

for line in list.readlines():
    asset = line.strip('\n')
    c = wmi.WMI(asset)
    try:
        for process in c.Win32_Process (name="SbClientManager.exe"):
            print asset, process.ProcessId, process.Name
    except Exception:
        pass

I have tried handling the exceptions in multiple way's to continue parsing my list, but the script continues to error out with the following:

    Traceback (most recent call last):
  File ".\check_service.py", line 12, in <module>
    c = wmi.WMI(asset)
  File "C:\Python27\lib\site-packages\wmi.py", line 1290, in connect
    handle_com_error ()
  File "C:\Python27\lib\site-packages\wmi.py", line 241, in handle_com_error
    raise klass (com_error=err)
wmi.x_wmi: <x_wmi: Unexpected COM Error (-2147023174, 'The RPC server is unavailable.', None, None)>

Ultimately, I am just trying to continue the script and catch the error. Maybe a note stating that IP was not responsive would be helpful. Here are the exceptions samples that I have tried:

except Exception:
    sys.exc_clear()

except:
    pass

except wmi.x_wmi, x:
    pass

Ofir Israel · Accepted Answer · 2013-09-11 17:55:16Z

3

The traceback you pasted says that the error is in the c = wmi.WMI(asset) line. You need to put that line inside the try block.

Like so:

import wmi
list = open("ips.txt")
bad_assets = []

for line in list.readlines():
    asset = line.strip('\n')
    try:
        c = wmi.WMI(asset)
        for process in c.Win32_Process (name="SbClientManager.exe"):
            print asset, process.ProcessId, process.Name
    except Exception:
        bad_assets.append(asset)

Also, trying to catch the right exception is recommended.

answered Sep 11, 2013 at 17:55

Ofir Israel

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