2. You can check if a email is valid by the checkdnsrr() function. It checks the email’s host address if it’s a valid DNS record. Should this function really b

2. You can check if a email is valid by the checkdnsrr() function. It checks the email’s host address if it’s a valid DNS record. Should this function really be used for email validation? 5. Easily unpack numeric arrays using the well-know function list <snip> Have you ever seen better code for swapping two variables’ values !? Yes, try Python: a, b = b, a