We use our MacBook Pro while on the go. Despite it has fantastic battery life, you might want to turn off the display quickly to save the battery, for suppose you went for one minute’s work out of your MacBook Pro.
Easy as Mac is always easy:
Hold the SHIFT + CONTROL key and hit the Eject key (top right corner of your MacBook Pro’s keyboard and it will be turned off. Hit Esc key to activate it again.