What is causing an error when opening a PPM image file in Python?

[ard12]

Homework Statement

I'm writing a program that will do simple image editing with ppm files. I can only use the graphics library and things in there. No PIL or Image module.

My problem is that I get an error that says "couldn't recognize data in image file "sole.ppm"
I know for a fact it is a correct ppm file.

The Attempt at a Solution

Here's my code:

def main():
print("Image Editor")
print()
filename = input("name of image file: ")
print()

with open(filename) as f:
    formatind = f.readline()
    width, height = [int(x) for x in f.readline().split()]
    colordepth = f.readline()
    array = []
    for line in f:
        array.append([int(x) for x in line.split()])

win = GraphWin("Image Editor!", width, height)

image = Image(Point(100,100), filename)

Display(image, array, width, height, win)

inf.close()
win.getMouse()
win.close()

main()

And my display function looks like this:

def Display(image, array, width, height, win):

for i in range(width):
    for j in range(0, height, 3):
        colors = color_rgb(array[i][j], array[i][j+1], array[i][j+2])
        image.setPixel(i, j, colors)
        image.draw(win)

return

I just cannot figure out what's wrong with this. Any help would be great. Thanks

 

[ard12]

I've just figured out that it's because of the format indicator. My file is P3. The Image constructor I used is not compatible with P3. I changed my file to P6 and it recognized the data. So I need another way of declaring an Image object for P3 format ppm file. Any ideas there?