pi@raspberrypi:~ $ python3
Python 3.7.3 (default, Dec 20 2019, 18:57:59) 
[GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from mfrc522 import SimpleMFRC522
>>> reader = SimpleMFRC522()
/usr/local/lib/python3.7/dist-packages/mfrc522/MFRC522.py:151: RuntimeWarning: This channel is already in use, continuing anyway.  Use GPIO.setwarnings(False) to disable warnings.
  GPIO.setup(pin_rst, GPIO.OUT)
>>> reader.write ('parcel1')
(1223443245, 'parcel1')         
>>> reader.read() 
(1223443245, 'parcel1         ')
>>>^Z
[2]+  Stopped