Python warnings module

In Python, the warnings module provides a way to handle warnings emitted by the Python interpreter or third-party libraries. When you use import warnings, you can control how warnings are displayed or handle them programmatically.

Here are some common use cases:

1. Filtering Warnings:
   You can use the warnings.filterwarnings() function to control which warnings should be displayed or ignored. This is useful when you want to suppress specific warnings that may not be critical to your application.

   import warnings

   # Ignore all DeprecationWarnings
   warnings.filterwarnings("ignore", category=DeprecationWarning)

2. Showing Warnings Once:
   If you only want to display a warning once, you can use the warnings.warn() function. This is helpful when you want to notify users about a potential issue but don’t want to flood the output with repetitive warnings.

   import warnings

   # Show a warning once
   warnings.warn("This is a warning message", Warning)

3. RuntimeWarning Display:
   By default, Python suppresses RuntimeWarning messages. If you want to display these warnings during runtime, you can enable them using warnings.simplefilter().

   import warnings

   # Show RuntimeWarning
   warnings.simplefilter("always", RuntimeWarning)