Generate Captcha

• 基于第三方库 Pillow 生成验证码图片
• 注意： 若不指定字体类型，需要把文件中的 msyh.ttf 拷贝到系统字体库中

创建画笔

draw = ImageDraw.Draw(img)  # 创建画笔

增加干扰线

def create_lines():
    """绘制干扰线
    """
    line_num = random.randint(*n_line)  # 干扰线条数

    for i in range(line_num):
        # 起始点
        begin = (random.randint(0, size[0]), random.randint(0, size[1]))
        # 结束点
        end = (random.randint(0, size[0]), random.randint(0, size[1]))
        draw.line([begin, end], fill=(0, 0, 0))

增加干扰点

def create_points():
    """绘制干扰点
    """
    chance = min(100, max(0, int(point_chance)))  # 大小限制在[0, 100]

    for w in range(width):
        for h in range(height):
            tmp = random.randint(0, 100)
            if tmp > 100 - chance:
                draw.point((w, h), fill=(0, 0, 0))

绘制验证码字符

def create_text(xy_, font_type_):
    """绘制验证码字符
    """
    c_chars = get_chars()
    text_ = '%s' % ' '.join(c_chars)  # 每个字符前后以空格隔开
    if font_type_ is None:
        curr_path = os.path.dirname(os.path.abspath(__file__))
        font_type_ = os.path.join(os.path.dirname(curr_path), "packages", "msyh.ttf")
    font = ImageFont.truetype(font_type_, font_size)
    if xy_ is None:
        font_width, font_height = font.getsize(text_)
        xy_ = ((width - font_width) / 3, (height - font_height) / 3)  # 左右距离/上下距离
    draw.text(xy_, text_, font=font, fill=fg_color)

    return ''.join(c_chars)

保存图片

# 图片路径
file_name_ = file_name if file_name else text
file_name = "{}.{}".format(file_name_, suffix)
file_path = os.path.join(image_path, file_name)
img.save(file_path)