• python验证码图片类，返回png图片和验证码字符串并且下载字体文件
• 记得安装PIL库和下载字体文件
• 用于登录注册验证码

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

class ValidCodeImg():
    def __init__(self,width=120,height=50,code_count=4,font_size=32,point_count=20,line_count=3,img_type='png'):
        '''
        生成验证码
        :param width: 宽度
        :param height: 高度
        :param code_count: 验证码数量
        :param font_size: 字体大小
        :param point_count: 噪点个数
        :param line_count: 划线个数
        :param img_type: 图片类型
        '''
        self.width = width
        self.height = height
        self.code_count = code_count
        self.font_size = font_size
        self.point_count = point_count
        self.line_count = line_count
        self.img_type = img_type

    @staticmethod
    def getRandomColor():
        '''
        获取随即颜色
        :return: RGB() 元组
        '''
        red = random.randint(0,255)
        green = random.randint(0,255)
        blue = random.randint(0,255)
        return (red,green,blue)

    @staticmethod
    def getRandomStr():
        '''
        获取0-9 a-z A-Z的随机1个字符
        :return:string
        '''
        return ''.join(random.sample(string.ascii_letters + string.digits, 1))

    def getValidCodeImg(self):
        #生成一个150*30的随即颜色图片
        image = Image.new('RGB',(self.width,self.height),self.getRandomColor())
        #画笔
        draw = ImageDraw.Draw(image)
        #字体 C:\Windows\Fonts
        font = ImageFont.truetype('App/static/Font/Inkfree.ttf',size=self.font_size)
        #验证码
        List = []
        for i in range(self.code_count):
            randomStr = self.getRandomStr()
            #写入验证码
            draw.text((10+i*30,-2),randomStr,self.getRandomColor(),font=font)
            List.append(randomStr)
        valid_str = ''.join(List)

        #噪线
        for i in range(self.line_count):
            x1 = random.randint(0,self.width)
            x2 = random.randint(0,self.width)
            y1 = random.randint(0,self.height)
            y2 = random.randint(0,self.height)
            draw.line((x1,y1,x2,y2),fill=self.getRandomColor())

        #噪点
        for i in range(self.point_count):
            #点
            draw.point([random.randint(0,self.width),random.randint(0,self.height)],fill=self.getRandomColor())
            x = random.randint(0,self.width)
            y = random.randint(0,self.height)
            draw.arc((x,y,x+4,y+4),0,90,fill=self.getRandomColor())

        #保存图片
        f = BytesIO()
        image.save(f,self.img_type)
        data = f.getvalue()
        f.close()

        return data,valid_str



if __name__ == '__main__':
    str = ValidCodeImg.getRandomStr()
    print(str)