自定义的验证码

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


def get_valid_img(request):

    def get_random_color():
        return (random.randint(0, 255),
                random.randint(0, 255),
                random.randint(0, 255))

    image = Image.new("RGB", (250, 40), get_random_color())

    # 生成五个随机字符
    draw = ImageDraw.Draw(image)
    font = ImageFont.truetype("static/blog/font/kumo.ttf", size=32)
    temp = []
    for i in range(5):
        random_num = str(random.randint(0, 9))
        random_low_alpha = chr(random.randint(97, 122)) #得到A~Z
        random_upper_alpha = chr(random.randint(65, 90)) #得到a~z
        random_char = random.choice([random_num, random_low_alpha, random_upper_alpha])
        draw.text((24+i*36, 0), random_char, get_random_color(), font=font)
        # 保存随机字符
        temp.append(random_char)

    # 噪点噪线
    # width=250
    # height=40
    # for i in range(100):
    #     x1=random.randint(0,width)
    #     x2=random.randint(0,width)
    #     y1=random.randint(0,height)
    #     y2=random.randint(0,height)
    #     draw.line((x1,y1,x2,y2),fill=get_random_color())
    #
    # for i in range(400):
    #     draw.point([random.randint(0, width), random.randint(0, height)], fill=get_random_color())
    #     x = random.randint(0, width)
    #     y = random.randint(0, height)
    #     draw.arc((x, y, x + 4, y + 4), 0, 90, fill=get_random_color())

    # 在内存生成图片
    from io import BytesIO
    f = BytesIO()
    image.save(f, "png")
    data = f.getvalue()
    f.close()

    valid_str = "".join(temp)
    print("valid_str", valid_str)
    # 设置session
    request.session["valid_str"] = valid_str

    return data