str vs rper dalam python

import datetime
today = datetime.datetime.now()
  
# Prints readable format for date-time object
print (str(today)) #2016-02-22 19:32:04.078030
  
# prints the official format of date-time object
print (repr(today))  #datetime.datetime(2016, 2, 22, 19, 32, 4, 78030)
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