How to make a character jump in Pygame?

I want to make my character jump. In my current attempt, the player moves up as long as I hold down SPACEv and falls down when I release SPACE.

Pygame Display Position

I need the window position right after I created a pygame window:

Pygame Display Position

I need the window position right after I created a pygame window:

Pygame Display Position

I need the window position right after I created a pygame window:

Pygame Display Position

I need the window position right after I created a pygame window:

Pygame Display Position

I need the window position right after I created a pygame window:

Pygame Display Position

I need the window position right after I created a pygame window:

Pygame Display Position

I need the window position right after I created a pygame window:

Pygame Display Position

I need the window position right after I created a pygame window:

Pygame Display Position

I need the window position right after I created a pygame window: