itchat实现微信好友头像拼接图

import itchat
import math
import os
import PIL.Image as Image

#给auto_login方法传入值为真的hotReload.即使程序关闭，一定时间内重新开启也可以不用重新扫码
itchat.auto_login(hotReload=True)
friends = itchat.get_friends(update=True)

#下载所有好友的头像图片
num = 0
for i in friends:
    img = itchat.get_head_img(i["UserName"])
    with open('./headImg/' + str(num) + ".jpg",'wb') as f:
        f.write(img)
        f.close()
        num += 1
#获取文件夹内的文件个数
length = len(os.listdir('./headImg'))
#根据总面积求每一个的大小
each_size = int(math.sqrt(float(810*810)/length))
#每一行可以放多少个
lines = int(810/each_size)
#生成白色背景新图片
image = Image.new('RGBA', (810, 810),'white')
x = 0
y = 0
for i in range(0,length):
    try:
        img = Image.open('./headImg/' + str(i) + ".jpg")
    except IOError:
        print(i)
        print("Error")
    else:
        img = img.resize((each_size, each_size), Image.ANTIALIAS) #resize image with high-quality
        image.paste(img, (x * each_size, y * each_size))
        x += 1
        if x == lines:
            x = 0
            y += 1
image.save('./headImg/' + "all.jpg")
#通过文件传输助手发送到自己微信中
itchat.send_image('./headImg/' + "all.jpg",'filehelper')
image.show()