Keyforge Wallpaper Generator w/ Comments

import json, requests, math, sys
from PIL import Image

def generate_wallpaper(argv):
    #determine the number of columns and rows based off of user input
    cols = int(argv[1])
    rows = math.ceil(36/cols)

    #get json data about the deck from the api
    response = requests.get('https://www.keyforgegame.com/api/decks/' + argv[0] + '/?links=cards')
    data = json.loads(response.content)

    #get a list of card ids from the json
    cardlist = data['data']['_links']['cards']
    #get the data for each card in the deck
    carddata = data['_linked']['cards']

    #create a blank image that matches the size of the rows and columns
    wallpaper = Image.new('RGB', (300*cols,420*rows))

    #the offsets will be used to make sure each image is pasted in the correct
    #place in the blank image
    x_offset = 0
    y_offset = 0
    max_offset = 300*cols

    for card in cardlist:
        #using the link to the card image, download the image
        image_link = [x['front_image'] for x in carddata if x['id'] == card][0]
        card_image = Image.open(requests.get(image_link, stream=True).raw)
        #paste the downloaded image into the blank image
        wallpaper.paste(card_image, (x_offset, y_offset))

        #update the offsets for the next card
        x_offset += 300
        if x_offset >= max_offset:
            x_offset = 0
            y_offset += 420

    #save the file
    wallpaper.save('keyforge_wallpaper.jpg')

if __name__ == "__main__":
    #this is where the program starts
    #it passes the arguements you specified to the generate_wallpaper function
    generate_wallpaper(sys.argv[1:])