How to use the klepto._inspect._keygen function in klepto

def wrapper(*args, **kwds):
            _args, _kwds = rounded_args(*args, **kwds)
            _args, _kwds = _keygen(user_function, ignore, *_args, **_kwds)
            key = keymap(*_args, **_kwds)

            try:
                # get cache entry
                result = cache[key]
                # record recent use of this key
                queue_append(key)
                refcount[key] += 1
                stats[HIT] += 1
            except KeyError:
                # if not in cache, look in archive
                if cache.archived():
                    cache.load(key)
                try:
                    result = cache[key]
                    # record recent use of this key

def wrapper(*args, **kwds):
            try:
                _args, _kwds = rounded_args(*args, **kwds)
                _args, _kwds = _keygen(user_function, ignore, *_args, **_kwds)
                key = keymap(*_args, **_kwds)
            except: #TypeError
                result = user_function(*args, **kwds)
                stats[MISS] += 1
                return result

            try:
                # get cache entry
                result = cache[key]
                use_count[key] += 1
                stats[HIT] += 1
            except KeyError:
                # if not in cache, look in archive
                if cache.archived():
                    cache.load(key)
                try:

def lookup(*args, **kwds):
            """Get the stored value for the given *args,**kwds"""
            _args, _kwds = rounded_args(*args, **kwds)
            _args, _kwds = _keygen(user_function, ignore, *_args, **_kwds)
            return cache[keymap(*_args, **_kwds)]

def key(*args, **kwds):
            """Get the cache key for the given *args,**kwds"""
            _args, _kwds = rounded_args(*args, **kwds)
            _args, _kwds = _keygen(user_function, ignore, *_args, **_kwds)
            return keymap(*_args, **_kwds)

def lookup(*args, **kwds):
            """Get the stored value for the given *args,**kwds"""
            _args, _kwds = rounded_args(*args, **kwds)
            _args, _kwds = _keygen(user_function, ignore, *_args, **_kwds)
            return cache[keymap(*_args, **_kwds)]

def key(*args, **kwds):
            """Get the cache key for the given *args,**kwds"""
            _args, _kwds = rounded_args(*args, **kwds)
            _args, _kwds = _keygen(user_function, ignore, *_args, **_kwds)
            return keymap(*_args, **_kwds)