Advanced is an interface with commonly used log level methods.

Contextual is an interface that allows context addition to a log statement before calling the final print (message/level) method.

FileHandler writes log to a file.

Handler writes logs to somewhere

Level type

Logger is the logger to record log

NullHandler does nothing, it discards anything.

RotatingFileHandler writes log a file, if file size exceeds maxBytes, it will backup current file and open a new one. max backup file number is set b

Standard is the interface used by Go's standard library's log package.

StreamHandler writes logs to a specified io Writer, maybe stdout, stderr, etc...

TimeRotatingFileHandler writes log to a file, it will backup current and open a new one, with a period time you sepecified. refer: http://docs.python