Logger class

Overview:

• The Logger class in Python implements logging functions, which can be used by Python Developers.

• There are methods in Logger class for most common severity levels of log entries used by developers. They are
  • debug()
  • info()
  • warning()
  • error()
  • critical()

• The logger class can be instantiated using the getlogger() method of logging module.

• Python using names given by developers maintains the logger instances.

• When no name is passed to the getlogger()method, a logger object with name root is returned.

• Though any meaningful name can be passed inside the getlogger()method, the recommended way is to pass the current module name by calling getLogger() with the parameter __name__. This will create loggers with the Python package hierarchy and the module name.

• To set the log level the logging.basicConfig method to be used passing the log level constants defined.

• The log levels defined in Python are given in the below table:

Example – Logging using logger class in Python:

Output – Sample log printed to stderr – i.e., Console: