Python生成随机图形验证码

在Python中，生成随机图形验证码通常涉及到图像处理库，如PIL（Python Imaging Library）或其更新版本Pillow，以及可能用到的随机数生成库如random和numpy。以下是一个简单的步骤概述：

1. 导入所需的库：

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

2. 定义图形元素，如线条、圆形、矩形、字母和数字：

def draw_random_shape(size, shapes):
    shape = random.choice(shapes)
    if shape == 'line':
        draw.line((random.randint(0, size), random.randint(0, size)),
                  (random.randint(0, size), random.randint(0, size)), fill=(0, 0, 0))
    elif shape == 'circle':
        center = (random.randint(0, size), random.randint(0, size))
        draw.ellipse((center-10, center-10, center+10, center+10), fill=(0, 0, 0))
    # 添加其他形状，如矩形等

def generate_text():
    return ''.join(random.choices('ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789', k=random.randint(4, 6)))

3. 创建验证码图像：

size = 100
image = Image.new('RGB', (size, size), color='white')
draw = ImageDraw.Draw(image)

shapes = ['line', 'circle', 'rectangle']  # 可自定义形状列表
for _ in range(random.randint(4, 6)):
    draw_random_shape(size, shapes)

text = generate_text()
font = ImageFont.truetype("arial.ttf", size=random.randint(20, 30))  # 加载字体
text_position = (random.randint(10, size-10), random.randint(10, size-10))
draw.text(text_position, text, font=font, fill=(0, 0, 0))

# 保存验证码图片
image.save('captcha.png')