Python Django log to console under runserver log to file under Apache

Question

How can I send trace messages to the console  like print  when I m running my Django app under manage py runserver  but have those messages sent to a log file when I m running the app under Apache   I reviewed Django logging and although I was impressed with its flexibility and configurability for advanced uses  I m still stumped with how to handle my simple use-case

User · Answer

You can configure logging in your settings py file    One example   if DEBUG        will output to your console     logging basicConfig          level   logging DEBUG          format      asctime s   levelname s   message s         else        will output to logging file     logging basicConfig          level   logging DEBUG          format      asctime s   levelname s   message s           filename     my log file log           filemode    a          However that s dependent upon setting DEBUG  and maybe you don t want to have to worry about how it s set up  See this answer on How can I tell whether my Django application is running on development server or not  for a better way of writing that conditional  Edit  the example above is from a Django 1 1 project  logging configuration in Django has changed somewhat since that version

User · Answer

Here s a Django logging-based solution  It uses the DEBUG setting rather than actually checking whether or not you re running the development server  but if you find a better way to check for that it should be easy to adapt   LOGGING          version   1       formatters              verbose                  format      levelname s   asctime s   module s   process d   thread d   message s                      simple                  format      levelname s   message s                         handlers              console                  level    DEBUG                class    logging StreamHandler                formatter    simple                      file                  level    DEBUG                class    logging FileHandler                filename     path to your file log                formatter    simple                         loggers              django                  handlers     file                 level    DEBUG                propagate   True                      if DEBUG        make all loggers use the console      for logger in LOGGING  loggers            LOGGING  loggers   logger   handlers       console     see https   docs djangoproject com en dev topics logging  for details

User · Answer

Text printed to stderr will show up in httpd s error log when running under mod wsgi  You can either use print directly  or use logging instead   print  gt  gt sys stderr   Goodbye  cruel world

User · Answer

I use this   logging conf    loggers  keys root applog  handlers  keys rotateFileHandler rotateConsoleHandler   formatters  keys applog format console format   formatter applog format  format   asctime s-   levelname -8s    message s   formatter console format  format   asctime s-  filename s  lineno d   levelname s    message s   logger root  level DEBUG handlers rotateFileHandler rotateConsoleHandler   logger applog  level DEBUG handlers rotateFileHandler qualname simple example   handler rotateFileHandler  class handlers RotatingFileHandler level DEBUG formatter applog format args   applog log    a   10000  9    handler rotateConsoleHandler  class StreamHandler level DEBUG formatter console format args  sys stdout     testapp py   import logging import logging config  def main        logging config fileConfig  logging conf       logger   logging getLogger  applog        logger debug  debug message       logger info  info message       logger warn  warn message       logger error  error message       logger critical  critical message        logging shutdown    if   name         main         main

User · Answer

This works quite well in my local py  saves me messing up the regular logging   from  settings import    LOGGING  handlers    console            level    DEBUG        class    logging StreamHandler        formatter    verbose    LOGGING  loggers    foo bar            handlers     console         propagate   False       level    DEBUG

User · Answer

You can do this pretty easily with tagalog  https   github com dorkitude tagalog   For instance  while the standard python module writes to a file object opened in append mode  the App Engine module  https   github com dorkitude tagalog blob master tagalog appengine py  overrides this behavior and instead uses logging INFO   To get this behavior in an App Engine project  one could simply do   import tagalog tagalog appengine as tagalog tagalog log  whatever message     whatever   tags      You could extend the module yourself and overwrite the log function without much difficulty

[python] Python/Django: log to console under runserver, log to file under Apache

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