Hello, I am looking for a nice way to take only those charachters from a string that are in another string and make a new string:
>>> astr = "Bob Carol Ted Alice" >>> letters = "adB" >>> some_func(astr,letters) "Bad" I can write this like this: astr = "Bob Carol Ted Alice" letters = "adB" import sets alist = [lttr for lttr in astr if lttr in Set(letters)] newstr = "" for lttr in alist: newstr += lttr But this seems ugly. I especially don't like "newstr += lttr" because it makes a new string every time. I am thinking that something like this has to be a function somewhere already or that I can make it more efficient using a built-in tool. Any ideas? James -- James Stroud UCLA-DOE Institute for Genomics and Proteomics Box 951570 Los Angeles, CA 90095 http://www.jamesstroud.com/ -- http://mail.python.org/mailman/listinfo/python-list
