How would you go about extracting part of a key from a dictionary.

I have a text file that lists about 1000 birthdays Ex. 1/2/1980
I want to extract just the year portion from the dictionary and then run a count against each year.
I have no problems with any of it, except how to ignore the 1/2/.

A couple way is split at / or use a regex.

>>> d = '1/2/2010'.split('/')[2]
>>> d

>>> import re
>>> s ='\d{4}', '1/2/2010')

And for counting from collections module defaultdict(int) (should be capilized but is not) or Counter for latest versions.

Another way

d = '1/2/2010'.split('/')[-1]