Why do I get encoding error in python warnings formatwarning on format string

Encoding errors typically occur when you try to read or write text data, and the data contains characters that cannot be represented in the chosen encoding. Encoding is the process of converting text from a human-readable format (e.g., characters) to a machine-readable format (bytes).
Python 3 uses Unicode for text, which means that you can work with a wide range of characters from different languages. However, to store or transmit text, it needs to be encoded into bytes, and decoding it back to characters can cause issues if the encoding is not properly specified or detected.
One common situation where encoding errors occur is when reading from or writing to files. If you don't specify the encoding explicitly, Python will use the default system encoding, which can cause problems when dealing with text that uses a different character set.
In this example, we define a custom formatwarning function that simplifies the warning message. By using this custom function, we ensure that any text, including special characters like "é," will be correctly handled during the warning mess