Python生成随机验证码图片

思路：

1、画一张白色的图片（大小为：200*50）

2、逐个填充像素点，每个像素点随机

3、往图片上写入字符

• 字符随机生成
• 字符的颜色是随机的
• 字符的组成：大写字母、小写字母以及数字

            
              from PIL import Image, ImageDraw, ImageFont
import numpy as np


def bgcolor():
    return np.random.randint(64, 255), np.random.randint(64, 255), np.random.randint(64, 255)


def randomtxt():
    txt_list = []
    txt_list.extend([i for i in range(65,91)])
    txt_list.extend([i for i in range(97,123)])
    txt_list.extend([i for i in range(48,58)])
    return chr(txt_list[np.random.randint(0, len(txt_list)-1)])


def txtcolor():
    return np.random.randint(32, 127), np.random.randint(32, 127), np.random.randint(32, 127)


def generatecode():
    width = 200
    height = 50
    image = Image.new('RGB', (width, height), (255, 255, 255))
    draw = ImageDraw.Draw(image)
    for w in range(width):
        for h in range(height):
            draw.point((w, h),fill=bgcolor())
    myfont = ImageFont.truetype('arial.ttf', 36)
    for i in range(4):
        draw.text((50*i+10,10), randomtxt(), font=myfont, fill=txtcolor())


    image.show()
    image.save(r'./res/验证码.png','PNG')


generatecode()