Update code_style.rst

doc/developers/code_style.rst

@@ -39,10 +39,34 @@ Private methods in Pastas are identified by a leading underscore. For example:
 This basically means that these methods may be removed or their behaviour may
 be changed without DeprecationWarning or any other form of notice.
 
-Logger Calls
-------------
+Logger Calls and Errors
+-----------------------
+
+A logger is used to provide information to the user and log info, warning, error
+messages. The logger is created using the `logging <https://docs.python.org/3/library/logging.html>`_
+module. The logger is created at the top of each file and can be imported in any module
+using:
+
+>>> import logging
+>>> logger = logging.getLogger(__name__)
+
+Info messages are logged using:
+
+>>> msg = "Message here, %s"
+>>> logger.info(msg, value)
+
 When a message to the logger is provided, it is important to use the
-s-string format (no f-strings) to prevent performance issues:
+s-string format (no f-strings) to prevent performance issues.
+
+Warning messages are logged using:
+
+>>>  logger.warning(msg, value)
+
+Error messages are logged, and raised using the appropriate error using:
 
->>> logger.info("Message here: %s", value)
+>>> logger.error(msg, value)
+>>> raise ValueError(msg % value)
 
+When raising an error, the error message should be provided in the logger.error method,
+and the error should be raised immediately after. This is to ensure that the error
+message is logged before the error is raised.