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----
-created: 2024-03-17
-description: Python logging with ✨pretty colors🌸
----
-
-## Logging > print
-Logging is useful, because all python code can use the same standard, allowing you to centrally control:
-
-- Which messages you wish to see
-    - Every debug message, for local development
-    - Disable debug messages, by changing 1 line e.g. for end user deployment
-- How to format them
-    - Do you wish to see which module and line of code this message originated from
-- Where they should end up
-    - Printed to [STDOUT](https://en.wikipedia.org/wiki/Standard_streams) (terminal)
-    - A log file
-    - A log server
-    - Maybe a notification should be triggered on CRITICAL errors
-
-> A python [*"module"*](https://docs.python.org/3/tutorial/modules.html) is simply just the name for a .py file. 
-> e.g. the file `database_handler.py` is a module called `database_handler`
-
-```py
-import logging
-
-
-class ColorFormatter(logging.Formatter):
-    grey = "\x1b[90;20m"
-    cyan = "\x1b[96;20m"
-    yellow = "\x1b[33;20m"
-    red = "\x1b[31;20m"
-    bold_red = "\x1b[31;1m"
-    reset = "\x1b[0m"
-    format = "%(asctime)s,%(msecs)03d %(levelname)-8s [%(filename)s:%(lineno)d] %(message)s"
-
-    FORMATS = {
-        logging.DEBUG: grey + format + reset,
-        logging.INFO: cyan + format + reset,
-        logging.WARNING: yellow + format + reset,
-        logging.ERROR: red + format + reset,
-        logging.CRITICAL: bold_red + format + reset
-    }
-
-    def format(self, record):
-        log_fmt = self.FORMATS.get(record.levelno)
-        formatter = logging.Formatter(log_fmt)
-        return formatter.format(record)
-
-
-logger = logging.getLogger(__name__)  # Instantiate a logger to be used in this module
-
-# Display every message Change this to INFO to see INFO and above (filter out DEBUG)
-# See: https://docs.python.org/3/howto/logging.html#logging-levels
-logger.root.setLevel(logging.DEBUG)
-
-stream_handler = logging.StreamHandler()  # This catches and handles log messages on the root handler
-stream_handler.setFormatter(ColorFormatter())
-logger.root.addHandler(stream_handler)
-
-logger.debug("debug message")
-logger.info("info message")
-logger.warning("warning message")
-logger.error("error message")
-logger.critical("critical message")
-```
-
-> Code snippet is modified, but based on:
-> [stackoverflow.com - How can I color Python logging output?](https://stackoverflow.com/questions/384076/how-can-i-color-python-logging-output#answer-56944256).
-> Used and credited as per [stackoverflow.com - CC BY-SA 4.0 content license](https://stackoverflow.com/help/licensing)
-
-<pre>
-$ python /tmp/1.py
-<span style="color:grey">2024-03-17 14:09:06,411,411 DEBUG    [1.py:37] debug message</span>
-<span style="color:var(--main-color)">2024-03-17 14:09:06,411,411 INFO     [1.py:38] info message</span>
-<span style="color:yellow">2024-03-17 14:09:06,411,411 WARNING  [1.py:39] warning message</span>
-<span style="color:red">2024-03-17 14:09:06,411,411 ERROR    [1.py:40] error message</span>
-<span style="font-weight: bold; color:red">2024-03-17 14:09:06,411,411 CRITICAL [1.py:41] critical message</span>
-</pre>
-
-
-In subsequent modules, do the following:
-```py
-import logging
-
-logger = logging.getLogger(__name__) # Set the logger name, to the name of the module
-
-logger.debug("debug message")
-logger.info("info message")
-logger.warning("warning message")
-logger.error("error message")
-logger.critical("critical message")
-```
-
-> Wish to change the colors?
-> Color codes can be found here: [wikipedia.org - ANSI escape codes](https://en.wikipedia.org/wiki/ANSI_escape_code#3-bit_and_4-bit)
-
-Okay, but why do we need to do it this way?
-
-Because logging is hieratical, these 2 loggers will be siblings under the root logger (see following tree structure).
-Therefore we set a handler on the root logger which ensures all logging will hit our formatting code.
-
-<pre>
-$ root
-├── <span class="devicons devicons-python"></span> main
-└── <span class="devicons devicons-python"></span> module_a
-</pre>
-
-You can set a breakpoint and inspect `logger.parent` to see this structure:
-```pycon
->>> logger.parent
-<RootLogger root (DEBUG)>
-```
-
-Read more: [docs.python.org - Logging HOWTO](https://docs.python.org/3/howto/logging.html)