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To create a grid, only 2 nested loops a re necessary. Use enumerate to iterate through the nested list self.components:

There are three different kinds of transparency supported in pygame: colorkeys, surface alphas, and pixel alphas; and you can't easily mix surface alphas and pixel alphas

If you want to use set_alpha to set the transparency of the entire Surface, you use surface alpha (that means setting, well, the alpha value of the entire surface).

But the image you want to use is a PNG which uses pixel alpha (that means each pixel has its own alpha value); so you should call convert_alpha on the Surface after loading so the image.

If you want to change the surface alpha of such an image, there are basically two ways:

Option 1: use a colorkey