code: def create_image_base64():
      
      code, file = create_image()
      b64str = "data:image/png;base64,"
      with open(file, "rb") as f:
          if sys.version_info.major == 2:
              b64str += base64.b64encode(f.read())
          else:
              b64str += base64.b64encode(f.read()).decode()
      os.remove(file)
      return True, {"code": code, "base64": b64str}
docs: 创建一个验证码 + 图片base64字符串流