code: def cpr(self) -> str:
          
          day = '{:02d}'.format(self.random.randint(1, 31))
          month = '{:02d}'.format(self.random.randint(1, 12))
          year = '{:02d}'.format(self.random.randint(0, 99))
          serial_number = '{:04d}'.format(self.random.randint(0, 9999))
  
          cpr_nr = '{}{}{}{}'.format(day, month, year, serial_number)
  
          return cpr_nr
docs: Generate a random CPR number (Central Person Registry).
  
          :return: CPR number.
  
          :Example:
              0105865167