Mastering Python Scripting for System Administrators

Generating warnings

warn() is used to generate the warnings. Now, we will see a simple example of generating warnings. Write a script called generate_warnings.py and write a following code in it:

import warningswarnings.simplefilter('error', UserWarning)print('Before')warnings.warn('Write your warning message here')print('After')

Run the script as follows:

$ python3 generate_warnings.pyOutput:Before:Traceback (most recent call last):  File "generate_warnings.py", line 6, in <module>    warnings.warn('Write your warning message here')UserWarning: Write your warning message here

In the preceding script, we passed a warning message through warn(). We used a simple filter so that your warning will get treated as an error and that error will get solved ...