python制作图片验证码示例

#coding=utf-8

import random
import os
import string
from PIL import Image, ImageDraw, ImageFont

def createCaptcha():
    #定义变量，用于画面的背景色、宽、高
    bgcolor = (random.randrange(20, 100), random.randrange(20, 100), 255)
    width = 100
    height = 25
    #创建画面对象
    im = Image.new(‘RGB‘, (width, height), bgcolor)
    #创建画笔对象
    draw = ImageDraw.Draw(im)
    #调用画笔的point()函数绘制噪点
    for i in range(0, 100):
        xy = (random.randrange(0, width), random.randrange(0, height))
        fill = (random.randrange(0, 255), 255, random.randrange(0, 255))
        draw.point(xy, fill=fill)
    #定义验证码的备选值
    str1 = string.digits+string.ascii_letters
    #随机选取4个值作为验证码
    rand_str = ‘‘
    for i in range(0, 4):
        rand_str += str1[random.randrange(0, len(str1))]
    #构造字体对象
    # font = ImageFont.truetype(‘Times_New_Roman.ttf‘, 23)
    font_types = os.listdir(‘/usr/share/fonts/truetype/msttcorefonts‘)#视字体.ttf文件所在具体路径而定
    font_type = random.choice(font_types)#选择电脑上的任意一种字体，根据具体路径
    font_size = random.randrange(14,22)
    font = ImageFont.truetype(font_type,font_size)
    #构造字体颜色
    fontcolor = (255, random.randrange(0, 255), random.randrange(0, 255))
    #绘制4个字
    draw.text((5, 2), rand_str[0], font=font, fill=fontcolor)
    draw.text((25, 2), rand_str[1], font=font, fill=fontcolor)
    draw.text((50, 2), rand_str[2], font=font, fill=fontcolor)
    draw.text((75, 2), rand_str[3], font=font, fill=fontcolor)
    #释放画笔
    del draw
    im.save(‘./captchas/‘+rand_str+‘.png‘) #保存在当前目录下的captchas文件夹里

if __name__ == ‘__main__‘:
    createCaptcha()