How to prevent exceptions to be printed twice ?

[vgalisson]

Hi,

When an exception occurs, its message is displayed on stdout (probably directly from the snap7 library?) and then the exception is thrown in Python which result in the message being displayed this like so :

Is there a way to prevent the first message (b'TCP : Invalid address') to be displayed ?
Thanks in advance for any help,

[swamper123]

Could you provide the minimal pythoncode you have used?

In general, if stuff is send to stdout inside of snap7, we can't handle it.
python-snap7 is just a wrapper around snap7 and what we can do is to check the error, which is a result of a snap7 function (which is the thing you see up there, beginning at row 2).

[vgalisson]

Here is a minimal example (no need to change the "XXXX")

import snap7
s7_client = snap7.client.Client()
connect = s7_client.connect("XXXX", 0, 0, 102)
connect = s7_client.connect("XXXX", 0, 0, 102)

[gijzelaerr]

The line starts with b'', which means it comes from python. My guess is that someone forgot to remove a debug print() statement from the python-snap7 code.

[gijzelaerr]

couldn't find a print, so my guess is then it is just the python logging. You could reconfigure the python logging module to set it to level CRITICAL, which would not print error messages.

so somewhere in your python code add something like:

import logging
logging.setLevel(logging.CRITICAL)

(untested)

[vgalisson]

Hi, thanks for the reply. It was indeed the logging library. There is no setLevel for logging directly so I used basicConfig instead.

import logging
logging.basicConfig(level=logging.CRITICAL)

To set only the snap7 logging to CRITICAL and not all log, one might use this:

import logging
logger = logging.getLogger("snap7")
logger.setLevel(logging.CRITICAL)