func (l *Logger) Printf(format string, args ...interface{}) {
	l.Output(2, LevelTrace, fmt.Sprintf(format, args...))
}
func (l *Logger) Printf(format string, args ...interface{}) {
	l.Output(2, LevelTrace, fmt.Sprintf(format, args...))
}
func ( l * Logger ) Printf ( format string , args ... interface { } ) { l . Output ( 2 , LevelTrace , fmt . Sprintf ( format , args ... ) ) }
// Printf records the log with trace level
Printf records the log with trace level