django产生验证码图片

安装需要的库: pip install pillow

view文件相关代码：

from django.shortcuts import HttpResponse
from django.utils.six import BytesIO
from PIL import Image, ImageDraw, ImageFont

def verify_code(request):
    # 引入随机函数模块
    import random
    # 定义变量， 用于画面的背景色，宽，高 RGB
    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)
    strl = 'ABCD123EFGHIJK456LMNOPQRS789TUVMXYZ0'
    rand_str = ''
    for i in range(0, 4):
        rand_str += strl[random.randrange(0, len(strl))]
    #构造字体对象,
    font = ImageFont.truetype('static/font/SIMLI.ttf', 23)
    fontcolor = (255, random.randrange(0,255),random.randrange(0,255))
    #绘制四个字
    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
    #存入session,用于做进一步验证
    request.session['verifycode'] = rand_str
    #内存文件操作
    buf = BytesIO()
    #将图片保存进内存中，文件类型为png
    im.save(buf, 'png')
    #将内存中的图片数据返回到客户端，MIMEpng
    return HttpResponse(buf.getvalue(), 'image/png')

url：

from django.urls import path
from . import views

urlpatterns = [
    path('verify_code', views.verify_code),
]