code: def __sum(self, line):
          
          splitted_line = line.split()
          try:
              ret = sum(map(int, splitted_line[1:(self.cpu_number + 1)]))
          except ValueError:
              # Correct issue #1007 on some conf (Raspberry Pi with Raspbian)
              ret = 0
          return ret
docs: Return the IRQ sum number.
  
          IRQ line samples:
          1:     44487        341         44         72   IO-APIC   1-edge      i8042
          LOC:   33549868   22394684   32474570   21855077   Local timer interrupts
          FIQ:   usb_fiq