基于PIL模块创建验证码图片

def get_valid_img(request):
    # 方式2：基于PIL模块创建验证码图片
    from PIL import Image, ImageDraw, ImageFont
    from io import BytesIO

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

    # img=Image.new("RGB",(350,38),get_random_color())
    # f=open("valid.png","wb")
    # img.save(f,"png")
    # with open("valid.png","rb") as f:
    #     data=f.read()

    # 方式3：
    # img=Image.new("RGB",(350,38),get_random_color())
    # f=BytesIO()
    # img.save(f,"png")
    # data=f.getvalue()

    # # 方式4:完善文本
    #
    # img=Image.new("RGB",(350,38),get_random_color())
    # draw=ImageDraw.Draw(img)
    # font=ImageFont.truetype("static/font/kumo.ttf",32)
    # draw.text((0,0),"python!",get_random_color(),font=font)
    #
    # # 写与读
    # f=BytesIO()
    # img.save(f,"png")
    # data=f.getvalue()

    # 方式5:
    #
    img = Image.new("RGB", (170, 35), get_random_color())
    draw = ImageDraw.Draw(img)
    font = ImageFont.truetype("static/font/kumo.ttf", 32)
    keep_str = ""
    for i in range(4):
        random_num = str(random.randint(0, 9))
        random_lowalf = chr(random.randint(97, 122))
        random_upperalf = chr(random.randint(65, 90))
        random_char = random.choice([random_num, random_lowalf, random_upperalf])
        draw.text((i * 30 + 30, 0), random_char, get_random_color(), font=font)
        keep_str += random_char

    #  加噪点
    width = 170
    height = 35
    for i in range(6):
        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(6):
        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())
    # 写与读
    f = BytesIO()
    img.save(f, "png")
    data = f.getvalue()
    print('keep_str', keep_str)
    # 将验证码存在各自的session中
    request.session['keep_str'] = keep_str

    return HttpResponse(data)