attempting to order versions that are "#.#.##.##"

version.py

def _determine_version(artifact):
    def determine_version(artifact):
        base_path, symlink_name = os.path.split(artifact)
        base_name = symlink_name.split('-')[0]
        version = None
        version_map = {}
        version_list = []

        list = os.listdir(base_path)

        #build a list of versions
        for file in [x for x in list if x.find(base_name) >= 0]:
            m = re.search(base_name + '-(\d+\.\d+\.\d+(\.\d+)*)', file)
            if m is not None:
                version_list.append( m.group(1))

        #attempt to order
        #TODO: work on this algorithm to get correctly ordered versions
        for version in version_list:
            c = version.split('.')
            number = int(c[0]) * 1000 + int(c[1]) * 100 + int(c[2]) * 6
            if len(c) > 3:
                number += int(c[3])
            version_map[number] = version

        key_list = version_map.keys()
        key_list.sort()
        
        #test the order of tke keys
        for key in key_list:
            print version_map[key]
            
        # return the next to last version (this was specific to my needs)    
        return version_map[key_list[len(key_list)-2]] if len(key_list) > 1 else None