Few Questions to the Example Code Python

Hello,

why is the IO error accepted here l23-26:
```
        try:
            self.write_register(self.IOCONTROL, 0x08)
        except IOError:
            pass
```

Can you elaborate line 51
```
(response[2]<<24) + (response[3]<<16) + (response[4]<<8) + response[5]
```