python应用学习（二）——生成验证码

---

前言

网站为例防止恶意注册、发帖等恶意操作而设置了验证码，其原理是将一串随机产生的数字或字母生成一幅图片，图片上加一下干扰元素。本文介绍利用python生成一个验证码，其中代码做了注释并于相关知识的解答

完成目标：
  生成如图所示的验证码

---

一、准备

1、python环境

2、涉及到的python库需要 pip install 包名 安装

pip install pillow

二、代码编写

1.引入库

import random,string,sys,math
from PIL import Image,ImageDraw,ImageFont,ImageFilter
import os

2.配置初始化参数

font_path = 'C:\Windows\Fonts\simfang.ttf'   #字体位置
number = 5                                   #生成几位数的验证码
size =(100,40)                               #生成验证码的图像大小
bgcolor = (255,255,255)                      #生成的背景色（白色）
draw_line = True                             #是否要加干扰线和干扰点
path = "vertification.png"                   #验证码存放位置

---

3.生成随机字符串

def random_text ():
    source = list(string.ascii_letters)  
    #print(source)
    for index in range(0,10):
        source.append(str(index))
    return ''.join(random.sample(source,1)) 

---

4.生成干扰线和干扰点

def random_line(drawpen,width,height):
    for i in range(random.randint(4,8)):
        linecolor = (random.randint(0,255),random.randint(0,255),random.randint(0,255))  #干扰线的颜色随机
        begin = (random.randint(0,width),random.randint(0,height))  #干扰线的位置随机
        end = (random.randint(0,width),random.randint(0,height))
        drawpen.line([begin,end],fill = linecolor)

def random_point(drawpen,width,height):
    for i in range(20):
        linecolor = (random.randint(0,255),random.randint(0,255),random.randint(0,255))  #干扰点的颜色随机
        begin = (random.randint(0,width),random.randint(0,height))   #干扰点的位置随机
        end = (random.randint(0,width),random.randint(0,height))
        drawpen.point([begin,end],fill = linecolor)

5.生成验证码的函数

def get_code():
    x_start = 2    
    y_start = 0   
    width,height = size        #验证码的宽和高
    image = Image.new('RGBA',(width,height),bgcolor)    #创建图片
    font = ImageFont.truetype(font_path,25)             #设置验证码的字体
    drawpen = ImageDraw.Draw(image)                     #生成画笔
    for i in range(number):
        fontcolor = (random.randint(0,255),random.randint(0,255),random.randint(0,255))     #验证码字体的颜色随机
        text = random_text()                                
        #font_width,font_height = font.getsize(text)
        x = x_start + i * int(width / (number))
        y = random.randint(y_start, int(height / 2))
        drawpen.text((x, y), text = text,font = font,fill = fontcolor)
        # drawpen.text(((width - font_width) / number,(height - font_height) / number),text = text,font = font,fill = fontcolor)
    if draw_line:
        random_line(drawpen,width,height)
        random_point(drawpen,width,height)
    # image = image.transform((width + 20,height + 20),Image.AFFINE,(1,-0.3,0,-0.1,1,0),Image.BILINEAR)    #创建扭曲
    # image = image.filter(ImageFilter.EDGE_ENHANCE_MORE)    #扭曲，边界加强
    image.save(path)
    os.startfile(path)

6.调用

if __name__ == "__main__":
    get_code()

最后

完整代码：（有后续补充的 详细注释）
https://download.csdn.net/download/weixin_45386875/15158218

其他python应用实例见：https://blog.csdn.net/weixin_45386875/article/details/113766276