How to use the portalocker.LockedFile function in portalocker

def read_dict_aux(filename):
    fp = portalocker.LockedFile(filename, 'r')
    lang_text = fp.read().replace('\r\n', '\n')
    fp.close()
    if not lang_text.strip():
        return {}
    try:
        return eval(lang_text)
    except:
        logging.error('Syntax error in %s' % filename)
        return {}

def write_plural_dict(filename, contents):
    if '__corrupted__' in contents:
        return
    try:
        fp = LockedFile(filename, 'w')
        fp.write('#!/usr/bin/env python\n{\n# "singular form (0)": ["first plural form (1)", "second plural form (2)", ...],\n')
        # coding: utf8\n{\n')
        for key in sorted(contents, lambda x, y: cmp(unicode(x, 'utf-8').lower(), unicode(y, 'utf-8').lower())):
            forms = '[' + ','.join([repr(Utf8(form))
                                   for form in contents[key]]) + ']'
            fp.write('%s: %s,\n' % (repr(Utf8(key)), forms))
        fp.write('}\n')
    except (IOError, OSError):
        if not is_gae:
            logging.warning('Unable to write to file %s' % filename)
        return
    finally:
        fp.close()

def write_dict(filename, contents):
    try:
        fp = portalocker.LockedFile(filename, 'w')
    except (IOError, OSError):
        if not is_gae:
            logging.warning('Unable to write to file %s' % filename)
        return
    fp.write('# coding: utf8\n{\n')
    for key in sorted(contents):
        fp.write('%s: %s,\n' % (utf8_repr(key), utf8_repr(contents[key])))
    fp.write('}\n')
    fp.close()

def load_storage(filename):
    fp = None
    try:
        fp = portalocker.LockedFile(filename, 'rb')
        storage = cPickle.load(fp)
    finally:
        if fp:
            fp.close()
    return Storage(storage)

def load_storage(filename):
    fp = None
    try:
        fp = portalocker.LockedFile(filename, 'rb')
        storage = cPickle.load(fp)
    finally:
        if fp: fp.close()
    return Storage(storage)

def save_storage(storage, filename):
    fp = None
    try:
        fp = portalocker.LockedFile(filename, 'wb')
        cPickle.dump(dict(storage), fp)
    finally:
        if fp:
            fp.close()