Character movement in Pygame Zero

As of right now, my character moves whilst I'm holding my key down.

e.g.

if keyboard.left:
   actor.x -= 5

However, I would like my actor to move in a sort of block-ish fashion e.g. I press my key once and it moves to the left by 5 pixels, regardless of whether I hold it down or not.

How would I do this?

First

if keyboard.left: 
    move_direction = 'left'

and later

if move_direction == 'left':
    actor.x -= 5

and don't reset move_direction.

Eventually it may need to keep only left or right to stop moving left only when you press right but not when you press top or bottom.

First

if keyboard.left: 
    move_horizontally = 'left'

if keyboard.right: 
    move_horizontally = 'right'

and later

if move_horizontally == 'left':
    actor.x -= 5
if move_horizontally == 'right':
    actor.x += 5