Django uses logging to print logs

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Django uses python’s own logging as a log printing tool. Let’s briefly introduce logging.

logging is thread-safe, and it mainly consists of 4 parts:

Logger

The direct interface used by users, Pass the log to Handler

Handler

Control where the log is output, console, file...

A logger can have Multiple Handler

Filter

Control which logs can flow from the logger to the Handler

##Formatter

Control the format of the log

Users use logging.getLogger([name]) to obtain the logger instance.

If there is no name, return the root logger (root logger) in the logger hierarchy. Calling this function with the same name always returns the same logger instance. This means that logger instances do not need to be passed around between various parts of the application.

Django customizes log output by using LOGGING in the settings file (including defining logger, handler, formatter, etc.)

For example, the settings file is defined as follows:

LOGGING = {
 'version': 1,
 'disable_existing_loggers': False,
 'formatters': {
  'verbose': {
   'format': '[%(asctime)s] [%(levelname)s] %(message)s'
  },
 },
 'handlers': {
  'console':{
   'level':'INFO',
   'class':'logging.StreamHandler',
   'formatter': 'verbose'
  },
  'file': {
   'level': 'INFO',
   'class': 'logging.FileHandler',
   'filename': 'D:/monitor.log',
   'formatter': 'verbose'
  },
  'email': {
   'level': 'ERROR',
   'class': 'django.utils.log.AdminEmailHandler',
   'include_html' : True,
  }
 },
 'loggers': {
  'django': {
   'handlers': ['console', 'file', 'email'],
   'level': 'INFO',
   'propagate': True,
  },
 },
}

Print log in code:

logger = logging.getLogger(‘django')
logger.info(“This is an error msg”)

[2017-07-15 17:44:51,316] [ERROR] This is an error msg

In this way, the log is printed to the terminal and file.

If you want to know more about django logging, please refer to the official website

https://docs.djangoproject.com/en/1.11/topics/logging/

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