from PIL import Image,ImageDraw,ImageFont    def addNum(filePath):      img = Image.open(filePath)      size = img.size      fontSize = size[1] / 4      draw = ImageDraw.Draw(img)           ttFont = ImageFont.truetype("/Library/Fonts/arial.ttf", fontSize)      draw.text((size[0]-fontSize, 0), "3",(256,0,0), font=ttFont)      del draw      img.save('./result.jpg')      img.show()    print addNum("image.jpg")