python图形图像处理--验证码的制作

from PIL import Image,ImageDraw,ImageFont
import random
from io import BytesIO

class code():
    def __init__(self):
        self.codelen=4
        self.codeCon="ABCDEFG23456789acbdsvjhn"
        self.width=120
        self.height=60
        self.im=None
        self.lineNum=0
        self.pointNum=0
    def randBgColor(self):
        return  (random.randint(0,120),random.randint(0,120),random.randint(0,120),220)
    def create(self):
        self.bg=self.randBgColor()
        self.im=Image.new("RGBA",size=(self.width,self.height),color=self.bg)
    def randFgColor(self):
        return (random.randint(0, 255), random.randint(0, 255), random.randint(0, 255),255)
    def lines(self):
        lineNum=self.lineNum or random.randint(5,10)
        draw = ImageDraw.Draw(self.im)
        for itenm in range(lineNum):
            place=(random.randint(0,self.width),random.randint(0,self.height),random.randint(0,self.width),random.randint(0,self.height))
            draw.line(place,fill=self.randFgColor(),width=random.randint(1,2))
    def point(self):
        pointNum = self.pointNum or random.randint(20, 60)
        draw = ImageDraw.Draw(self.im)
        for itenm in range(pointNum):
            place = (random.randint(0, self.width), random.randint(0, self.height))
            draw.point(place, fill=self.randFgColor())
    def rote(self):
        self.im=self.im.rotate(random.randint(-10,20))
        im1=Image.new("RGBA",size=(self.width,self.height),color=self.bg)
        self.im=Image.composite(self.im,im1,self.im)
    def text(self):
        draw = ImageDraw.Draw(self.im)
        for item in range(self.codelen):
            self.codeCon[random.randint(0,len(self.codeCon)-1)]
            text=self.codeCon[random.randint(0,len(self.codeCon)-1)]
            draw.text((item*self.width/self.codelen,random.randint(0,self.height-40)),text,fill=self.randFgColor(),font=ImageFont.truetype("C:/Windows/Fonts/AdobeSongStd-Light.otf",random.randint(26,50)))
        self.rote()
    def output(self):
        self.create()
        self.lines()
        self.point()
        self.text()
        self.im.show()
        # self.im.save("11.png","png")
        bt=BytesIO()
        self.im.save(bt,"png")  #保存内存
        return  bt.getvalue()

codeobj=code()
codeobj.output()