My solution python challenge 1 http://www.pythonchallenge.com/pc/def/map.html

foo.py

text ='''g fmnc wms bgblr rpylqjyrc gr zw fylb. rfyrq ufyr amknsrcpq ypc dmp. bmgle gr gl zw fylb gq glcddgagclr ylb rfyr'q ufw rfgq rcvr gq qm jmle. sqgle qrpgle.kyicrpylq() gq pcamkkclbcb. lmu ynnjw ml rfc spj.'''


def trans(string):
        poop=''
        for i in string:
                #if i in ['.' , ',' , ')' , '(' , "'"," "]: #dont translate special characters
                if in in " .,'():;":
                    poop+=i
                else:
                        if ord(i)<ord('y'):
                                poop+=chr(ord(i)+2)
                        else:           # we dont want { to come after(in ascii code) z , instead of a, do we ?
                                poop+=chr(ord(i)-24)
        return poop


print text
print trans(text)
print trans('map')