python3 pillow模块实现简单验证码

# -*- coding: utf-8 -*-# __author__: Pad0yfrom PIL import Image, ImageDraw, ImageFontfrom random import choice, randint, randrangeimport string# 候选字符集,大小写字母+数字chrs = string.ascii_letters + string.digitsdef selected_chrs(length):  """  返回length个随机字符串  :param length:  :return:  """  result = ''.join(choice(chrs) for _ in range(length))  return resultdef get_color():  """  设置随机颜色  :return:  """  r = randint(0, 255)  g = randint(0, 255)  b = randint(0, 255)  return (r, g, b)def main(size=(200, 100), chrNumber=6, bgcolor=(255, 255, 255)):  """  定义图片大小，验证码长度，背景颜色  :param size:  :param chrNumber:  :param bgcolor:  :return:  """  # 创建空白图像和绘图对象  image_tmp = Image.new('RGB', size, bgcolor)  draw = ImageDraw.Draw(image_tmp)  # 生成并计算随机字符的宽度和高度  text = selected_chrs(chrNumber)  font = ImageFont.truetype('c://windows//fonts//Roboto-Regular.ttf', 48) # 选定一款系统字体  width, height = draw.textsize(text, font)  if width + 2*chrNumber > size[0] or height > size[1]:    print('Size Error!')    return  # 绘制字符串  startX = 0  width_eachchr = width // chrNumber # 计算每个字符宽度  for i in range(chrNumber):    startX += width_eachchr + 1    position = (startX, (size[1]-height)//2+randint(-10, 10)) # 字符坐标, Y坐标上下浮动    draw.text(xy=position, text=text[i], font=font, fill=get_color()) # 绘制函数  # 对像素位置进行微调，实现验证码扭曲效果  img_final = Image.new('RGB', size, bgcolor)  pixels_final = img_final.load()  pixels_tmp = image_tmp.load()  for y in range(size[1]):    offset = randint(-1, 0) # randint()相当于闭区间[x,y]    for x in range(size[0]):      newx = x + offset # 像素微调      if newx >= size[0]:        newx = size[0] - 1      elif newx < 0:        newx = 0      pixels_final[newx, y] = pixels_tmp[x, y]  # 绘制随机颜色随机位置的干扰像素  draw = ImageDraw.Draw(img_final)  for i in range(int(size[0]*size[1]*0.07)): # 7%密度的干扰像素    draw.point((randrange(size[0]), randrange(size[1])), fill=get_color()) # randrange取值范围是左开右闭  # 绘制随机干扰线，这里设置为8条  for i in range(8):    start = (0, randrange(size[1]))    end = (size[0], randrange(size[1]))    draw.line([start, end], fill=get_color(), width=1)  # 绘制随机弧线  for i in range(8):    start = (-50, -50) # 起始位置在外边看起来才会像弧线    end = (size[0]+10, randint(0, size[1]+10))    draw.arc(start+end, 0, 360, fill=get_color())  # 保存图片  img_final.save('Veri_code.jpg')  img_final.show()if __name__ == '__main__':  main((200, 100), 6, (255, 255, 255))