[GitHub] [airflow] ashb commented on issue #5681: [AIRFLOW-5065] Add colors to console log

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ashb commented on issue #5681: [AIRFLOW-5065] Add colors to console log
URL: https://github.com/apache/airflow/pull/5681#issuecomment-516370691
 
 
   `coloredlogs` doesn't look like it gives the flexability we want (the 
different colours for each of the parts is _really_ nice) but 
https://github.com/borntyping/python-colorlog (`pip install colorlog`) is close:
   
   ```python
   from colorlog import ColoredFormatter
   import logging
   
   logging.basicConfig(level=logging.INFO)
   
   log = logging.getLogger(__name__)
   
   log_format = '[%(blue)s%(asctime)s%(reset)s] 
{%(blue)s%(filename)s%(reset)s:%(lineno)d} %(log_color)s%(levelname)s%(reset)s 
- %(message_log_color)s%(message)s'
   formatter = ColoredFormatter(
       log_format,
       log_colors={
           'WARNING': 'yellow',
           'ERROR': 'red',
           'CRITICAL': 'red,bold',
       },
       secondary_log_colors={
           'message': {
               'INFO': 'bold',
           }
       },
   )
   
   logging.root.handlers[0].setFormatter(formatter)
   
   log.info("Usiung connection to: %s", {'id': 'proxy_postgres_tcp'})
   log.warning("Hi")
   log.error("Hi")
   
   try:
       raise RuntimeError("x")
   except Exception:
       log.critical("err")
   ```
   
   Looks like:
   
   ![Screenshot 2019-07-30 at 11 56 
19](https://user-images.githubusercontent.com/34150/62123993-1149eb00-b2c1-11e9-8ca2-0777ae63f58e.png)
   
   And it automatically detects when in a TTY. _But_ it may not be written in a 
way that lets us get the colours we want.

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