Flask 生成验证码 支持干扰线、噪点

from PIL import Image, ImageDraw, ImageFont, ImageColor

import random

DEFAULT_FONT_PATH = 'c:\windows\fonts\arial.ttf'
def generate_verify_code(len, width, height,font_path=None, font_size=32, bg_color=None,
                         disturb_lines=20, disturb_points = 1000,
                         rotation=(-60, 60)):
    # 指定字体路径
    font_path = font_path or DEFAULT_FONT_PATH
    ##初始化字体
    font_obj = ImageFont.FreeTypeFont(font_path, font_size)

    words = '0123456789abcdefghijklmnopqrstuvwxyz'
    # 默认图片大小
    img_size = (width, height)

    ##随机字符
    def _rand_word():
        return random.choice(words)

    ##填充文字颜色
    def _rand_color():
        return tuple(random.randint(64, 254) for _ in range(0, 3))

    # 背景色
    bg_color = bg_color or _rand_color()

    # 旋转随机角度default-60 -> 60]
    def _rand_rotation():
        return random.randint(*rotation)

    ##生成文字
    _words_obj = []
    #返回验证码
    _words_code = []
    for _ in range(len):
        ##背景透明
        _img = Image.new('RGBA', (int(font_size * 0.75), font_size + 2))
        ## 初始化画笔
        _draw = ImageDraw.Draw(_img)
        ## 写字
        tmp = _rand_word()
        _words_code.append(tmp)
        _draw.text((0 + 2,0), tmp, _rand_color(), font=font_obj)
        #释放画笔
        del _draw
        #旋转角度
        _rotated = _img.rotate(_rand_rotation())
        _words_obj.append(_rotated)

    #创建验证码
    img_code = Image.new('RGB', img_size, bg_color)
    #添加随机噪点
    _draw = ImageDraw.Draw(img_code)
    for _ in range(disturb_points):
        x = random.randint(0, img_code.width)
        y = random.randint(0, img_code.height)
        _draw.point((x, y), fill=_rand_color())
    # 添加干扰线
    lines = [(random.randint(0, img_code.width),
              random.randint(0, img_code.height),
              random.randint(0, img_code.width),
              random.randint(0, img_code.height)
              ) for _ in range(disturb_lines)]
    for line in lines:
        _draw.line(line, fill=_rand_color())
    del _draw
    #初始位置
    _x = 10
    _y = 0
    offset = 10
    for word in _words_obj:
        #控制打印文字位置
        _w = _x + word.width
        _h = _y + word.height
        img_code.paste(word, (_x, _y, _w, _h), word.convert('RGBA'))
        _x = _x + word.width + offset

    print(_words_code)
    img_code.save(r'C:UserslDesktopcode.png')
    
generate_verify_code(4, 140, 40, bg_color=(40, 67, 135), disturb_lines=10, disturb_points=200,
                     rotation=(-30, 30))