text: #!/usr/bin/env python
  # -*- coding: utf8 -*-
  #
  #    Copyright 2014,2018 Mario Gomez <mario.gomez@teubi.co>
  #
  #    This file is part of MFRC522-Python
  #    MFRC522-Python is a simple Python implementation for
  #    the MFRC522 NFC Card Reader for the Raspberry Pi.
  #
  #    MFRC522-Python is free software: you can redistribute it and/or modify
  #    it under the terms of the GNU Lesser General Public License as published by
  #    the Free Software Foundation, either version 3 of the License, or
  #    (at your option) any later version.
  #
  #    MFRC522-Python is distributed in the hope that it will be useful,
  #    but WITHOUT ANY WARRANTY; without even the implied warranty of
  #    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  #    GNU Lesser General Public License for more details.
  #
  #    You should have received a copy of the GNU Lesser General Public License
  #    along with MFRC522-Python.  If not, see <http://www.gnu.org/licenses/>.
  
  import RPi.GPIO as GPIO
  import MFRC522
  import signal
  
  continue_reading = True
  
  # function to perform cleanup when the script is aborted
  def end_read(signal,frame):
      global continue_reading
      print("Ctrl+C captured, ending read.")
      continue_reading = False
      GPIO.cleanup()
  
  signal.signal(signal.SIGINT, end_read)
  
  # Create an object of class MFRC522
  MIFAREReader = MFRC522.MFRC522()
  
  # Continue looking for cards till the script is manually aborted
  while continue_reading:
  
      # Search for NFC cards
      (status,TagType) = MIFAREReader.MFRC522_Request(MIFAREReader.PICC_REQIDL)
  
      # Check if card detected
      if status == MIFAREReader.MI_OK:
          print("Card detected")
  
      # get the data of the card that been touched
      (status,uid) = MIFAREReader.MFRC522_Anticoll()
  
      # If UID received, continue
      if status == MIFAREReader.MI_OK:
  
          # Print UID in console 
          print("Card read UID: %s,%s,%s,%s" % (uid[0], uid[1], uid[2], uid[3]))
  
          # Standard encryption key for the NFC card (default)
          key = [0xFF,0xFF,0xFF,0xFF,0xFF,0xFF]
  
  
          MIFAREReader.MFRC522_SelectTag(uid)
  
          # Authorization
          status = MIFAREReader.MFRC522_Auth(MIFAREReader.PICC_AUTHENT1A, 8, key, uid)
          print("\n")
  
          # Check if authenticated
          if status == MIFAREReader.MI_OK:
  
              # This is the data that we want to write into the NFC card
              data = [99, 11, 55, 66, 44, 111, 222, 210, 125, 153, 136, 199, 144, 177, 166, 188]
  
              for x in range(0,16):
                  data.append(0xFF)
  
              print("Sector 8 looked like this:")
              # Block 8 lesen
              MIFAREReader.MFRC522_Read(8)
              print("\n")
  
              print("Sector 8 will now be filled with 0xFF:")
              # Write data into the NFC card
              MIFAREReader.MFRC522_Write(8, data)
              print("\n")
  
              print("It now looks like this:")
              # Checks how the card looks like after it's been written
              MIFAREReader.MFRC522_Read(8)
              print("\n")
  
              MIFAREReader.MFRC522_StopCrypto1()
  
              # Make sure that card reading is set.
              continue_reading = False
          else:
              print("Authentification error")
  