extract last two fields from split

Question

I want to extract last two field values from a variable of varying length. For example, consider the three values below:

fe80::e590:1001:7d11:1c7e

ff02::1:f         


        

Answer 1

If s is the string containing the IPv6 address, use

s.split(":")[-2:]

to get the last two components. The split() method will return a list of all components, and the [-2:] will slice this list to return only the last two elements.

Answer 2

You can use str.rsplit() to split from the right:

>>> ipaddress = 'fe80::e590:1001:7d11:1c7e'
>>> ipaddress.rsplit(':', 2) # splits at most 2 times from the right
['fe80::e590:1001', '7d11', '1c7e']

This avoids the unnecessary splitting of the first part of the address.