Python access variable

Question

Im new to python and im trying something with pygame but dont know how should I do this..

def addRect(x, y, width, height, color, surface):
    rect = pygame.Rect(x, y, width, height)
    pygame.draw.rect(surface, color, rect)
    pygame.display.flip()

Thats for creating rectangles but my question is how should I access the ractangles I create ? Im trying something like .

r1 = addRect(20, 40, 200, 200, (61, 61, 61), screen)

But then when I try to move it using

r1.move(10,10)

I get an error

r1.move(10,10) AttributeError: 'NoneType' object has no attribute 'move'

How should I access it ? thanks-

You are not returning the rect from the function.

Rohit Jain
– Rohit Jain

2013-07-21 14:46:46 +00:00
Commented Jul 21, 2013 at 14:46 — Rohit Jain
– Rohit Jain, Commented Jul 21, 2013 at 14:46

Sukrit Kalra · Accepted Answer · 2013-07-21 14:56:29Z

2

Python functions have a default return value of None. Since, you don't have a return statement in your function, it returns None which does not have an attribute move().

From The Python Docs

In fact, even functions without a return statement do return a value, albeit a rather boring one. This value is called None (it’s a built-in name).

>>> def testFunc(num):
        num += 2

>>> print testFunc(4)
None

You need to add a return statement to return the rect variable.

def addRect(x, y, width, height, color, surface):
    rect = pygame.Rect(x, y, width, height)
    pygame.draw.rect(surface, color, rect)
    pygame.display.flip()
    return rect

edited Jul 21, 2013 at 14:56

answered Jul 21, 2013 at 14:51

Sukrit Kalra

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svineet · Accepted Answer · 2013-07-21 14:52:29Z

2

I don't know much PyGame but you could modify addRect -

def addRect(x, y, width, height, color, surface):
    rect = pygame.Rect(x, y, width, height)
    pygame.draw.rect(surface, color, rect)
    pygame.display.flip()
    return rect # Added this line. Returns the rect object for future use.

Then you can make rects and use methods too -

rect1 = addRect(20, 40, 200, 200, (61, 61, 61), screen)
rect1.move(10,10)

That should work

answered Jul 21, 2013 at 14:52

svineet

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