opencart language file merge

import dircache, os, re, shutil

dir1 = 'english/'
dir2 = 'icelandic/'
dest = 'merged/'

def getLines(file):
    fh = open(file, 'r')
    lines = {}
    for l in fh.readlines():
        if l[:1] != '$':
            continue

        try:
            v = re.match("\$_\['(.*)'\].* '(.*?)';", l).groups()
            lines[v[0]] = v[1]
        except:
            continue
    fh.close()
    return lines

def mergeFiles(file1, file2):
    # Merge the contents of the files and return. file2 items will prevail if items exist in both files.
    return dict(getLines(file1).items() + getLines(file2).items())

def writeFile(filename, contents):
    lines = ["<?php\n"]

    for k in contents.keys():
        lines.append("$_['%s'] = '%s';\n" % (k, contents[k]))

    lines.append("?>\n")

    fh = open(filename, 'w')
    fh.writelines(lines)
    fh.close()


shutil.copytree(dir1, dest)
for f in dircache.listdir(dir1):
    if os.path.isdir(dir1+f):
        # Go through subdirectories
        for file in dircache.listdir(dir1 + f):
            filename = str(f) + '/' + str(file)
            print filename

            if not os.path.exists(dir2 + filename):
                # Need to copy dir1 file to dest
                shutil.copyfile(dir1 + filename, dest + filename)
            else:
                # Compare contents (translation strings)
                merged = mergeFiles(dir1 + filename, dir2 + filename)
                writeFile(dest+filename, merged)

    else:
        # Is a file, probably <language.php> in the root folder.
        merged = mergeFiles(dir1 + f, dir2 + dir2[:-1] + '.php')
        writeFile(dest+dir2[:-1] + '.php',merged)