python 生成图形验证码的方法示例

def getRandomColor():
  r = random.randint(0, 255)
  g = random.randint(0, 255)
  b = random.randint(0, 255)
  return (r, g, b)

def getRandomChar():
  random_num = str(random.randint(0, 9))
  random_lower = chr(random.randint(97, 122)) # 小写字母a~z
  random_upper = chr(random.randint(65, 90)) # 大写字母A~Z
  random_char = random.choice([random_num, random_lower, random_upper])
  return random_char

# 图片宽高
width = 160
height = 50

def createImg():
  bg_color = getRandomColor()
  # 创建一张随机背景色的图片
  img = Image.new(mode="RGB", size=(width, height), color=bg_color)
  # 获取图片画笔，用于描绘字
  draw = ImageDraw.Draw(img)
  # 修改字体
  font = ImageFont.truetype(font="arial.ttf", size=36)
  for i in range(5):
    # 随机生成5种字符+5种颜色
    random_txt = getRandomChar()
    txt_color = getRandomColor()
    # 避免文字颜色和背景色一致重合
    while txt_color == bg_color:
      txt_color = getRandomColor()
    # 根据坐标填充文字
    draw.text((10 + 30 * i, 3), text=random_txt, fill=txt_color, font=font)
  # 打开图片操作，并保存在当前文件夹下
  with open("test.png", "wb") as f:
    img.save(f, format="png")

def drawLine(draw):
  for i in range(5):
    x1 = random.randint(0, width)
    x2 = random.randint(0, width)
    y1 = random.randint(0, height)
    y2 = random.randint(0, height)
    draw.line((x1, y1, x2, y2), fill=getRandomColor())

def drawPoint(draw):
  for i in range(50):
    x = random.randint(0, width)
    y = random.randint(0, height)
    draw.point((x,y), fill=getRandomColor())

def createImg():
  bg_color = getRandomColor()
  # 创建一张随机背景色的图片
  img = Image.new(mode="RGB", size=(width, height), color=bg_color)
  # 获取图片画笔，用于描绘字
  draw = ImageDraw.Draw(img)
  # 修改字体
  font = ImageFont.truetype(font="arial.ttf", size=36)
  for i in range(5):
    # 随机生成5种字符+5种颜色
    random_txt = getRandomChar()
    txt_color = getRandomColor()
    # 避免文字颜色和背景色一致重合
    while txt_color == bg_color:
      txt_color = getRandomColor()
    # 根据坐标填充文字
    draw.text((10 + 30 * i, 3), text=random_txt, fill=txt_color, font=font)
  # 画干扰线点
  drawLine(draw)
  drawPoint(draw)
  # 打开图片操作，并保存在当前文件夹下
  with open("test.png", "wb") as f:
    img.save(f, format="png")