Indentation error in space invaders Python

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1.00/5 (1 vote)

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I have the following code, which gives me an indentation error:

running = True
while running:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_LEFT:
                player.speed_x = -5
            elif event.key == pygame.K_RIGHT:
                player.speed_x = 5
			elif event.key == pygame.K_a:
                player.shoot(RED)
			elif event.key == pygame.K_s:
				player.shoot(GREEN)
			elif event.key == pygame.K_d: 
				player.shoot(BLUE)
			elif event.key == pygame.K_f: 
				player.shoot(YELLOW)

What I have tried:

I have tried to erase the line, but it doesn't work

Posted 15-Aug-24 7:42am

vicxtor3ljb

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PIEBALDconsult 15-Aug-24 20:49pm

Infested with TABs?

2 solutions

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Pete O'Hanlon · Answer 1 · 2024-08-15T08:11:00

Solution 1

If I had to guess, you have a mix of tabs and spaces somewhere in there. That's a common pain point.

Posted 15-Aug-24 8:11am

Pete O'Hanlon

OriginalGriff · Answer 2 · 2024-08-15T19:11:00

To add to what Pete has said, most editors - or at least the half decent ones - have options for using tabs or spaces, and replacing one with the other. Set that to spaces so that tabs are automatically replaced in the file and your problem should go away, or at least be visible.

Python is a poor language for this very reason: whitespace is significant, and TAB and SPACE are not equivalent: what looks like three spaces on screen could be one, two, or three characters in the file but Python looks only at the file content, and counts each whitespace character as a single whitespace.
Since the number of whitespace characters must exactly match to get the right indentation, it's very easy to get "indentation errors" that you cannot see!

It's understandable - the "size" of a tab can vary both depending on it's position in the line and on the editor settings (most competent editors will allow you to specify a tab at each , 3, 4, ... characters on a line but Python doesn't know which editor you used) but it's a fundamental problem with the language design ... and a good reason why beginners shouldn't learn it! :laugh: