pygame error, No video mode has been set

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I believe that you need to call:

screen = pygame.display.set_mode((800, 600)) # change to the real resolution

this call will actually return the surface that you want to blit on. Below is the documentation from the linked resource.

pygame.display.set_mode()

Initialize a window or screen for display

set_mode(resolution=(0,0), flags=0, depth=0) -> Surface

This function will create a display Surface. The arguments passed in
are requests for a display type. The actual created display will be
the best possible match supported by the system.

The resolution argument is a pair of numbers representing the width
and height. The flags argument is a collection of additional options.
The depth argument represents the number of bits to use for color.

The Surface that gets returned can be drawn to like a regular Surface
but changes will eventually be seen on the monitor.

If no resolution is passed or is set to (0, 0) and pygame uses SDL
version 1.2.10 or above, the created Surface will have the same size
as the current screen resolution. If only the width or height are set
to 0, the Surface will have the same width or height as the screen
resolution. Using a SDL version prior to 1.2.10 will raise an
exception.

It is usually best to not pass the depth argument. It will default to
the best and fastest color depth for the system. If your game requires
a specific color format you can control the depth with this argument.
Pygame will emulate an unavailable color depth which can be slow.

When requesting fullscreen display modes, sometimes an exact match for
the requested resolution cannot be made. In these situations pygame
will select the closest compatible match. The returned surface will
still always match the requested resolution.

The flags argument controls which type of display you want. There are
several to choose from, and you can even combine multiple types using
the bitwise or operator, (the pipe “|” character). If you pass 0 or no
flags argument it will default to a software driven window. Here are
the display flags you will want to choose from:

pygame.FULLSCREEN    create a fullscreen display
pygame.DOUBLEBUF     recommended for HWSURFACE or OPENGL
pygame.HWSURFACE     hardware accelerated, only in FULLSCREEN
pygame.OPENGL        create an OpenGL renderable display
pygame.RESIZABLE     display window should be sizeable
pygame.NOFRAME       display window will have no border or controls

For example:

# Open a window on the screen
screen_width=700
screen_height=400
screen=pygame.display.set_mode([screen_width,screen_height])

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