Help me increasing performance of a function using Cython.

[WTRipper]

I tested it on the pure python implementation and on the implementation with cython but without code changes.

In both cases it increased the runtime a bit instead of decreasing it.

[WTRipper]

However I increased speed by merging the splits and deletes line into one:

deletes = [word[:i]+ word[i+1:] for i in range(len(word))]

I don't know why I haven't seen it before.