A more direct approach is to write a helper function that extracts the desired
data from a field,
and use that as the sort key:
hostnames = '''sys01-xxx-austin-tx
sys02-xxx-austin-tx
sys01-xxx-newark-oh
sys01-yyy-newark-oh
sys01-yyy-austin-tx
sys01-zzz-newark-oh
sys02-zzz-newark-oh'''.split()
def getCity(hostName):
return hostName.split('-', 2)[-1]
hostnames.sort(key=getCity)
for line in hostnames:
print line
Kent
Kent Johnson wrote:
> Tom Tucker wrote:
>
>>Good morning! Does Python have a sort function thats supports a delimiter?
>>For example, I want to sort the below hostnames, based on the city.
>
>
> This is easy to do in Python but you have to break it up into a few steps -
> Python's sort doesn't
> know how to find fields but you can break the text into fields yourself, then
> sort on the desired
> field. Here is one way:
>
> import operator
>
> hostnames = '''sys01-xxx-austin-tx
> sys02-xxx-austin-tx
> sys01-xxx-newark-oh
> sys01-yyy-newark-oh
> sys01-yyy-austin-tx
> sys01-zzz-newark-oh
> sys02-zzz-newark-oh'''.split()
>
> # Create a list of field lists by splitting on the first two '-'
> fieldData = [ line.split('-', 2) for line in hostnames ]
>
> # The key parameter must be a function that returns the key
> # value from a list item.
> # operator.itemgetter creates a function that accesses the desired index
> fieldData.sort(key=operator.itemgetter(2))
>
> # Put the fields back together and print
> for line in fieldData:
> print '-'.join(line)
>
>
> Kent
>
> _______________________________________________
> Tutor maillist - Tutor@python.org
> http://mail.python.org/mailman/listinfo/tutor
>
_______________________________________________
Tutor maillist - Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor
