I've wondered why extend/append methods of Python don't return a reference to result list.
To build string of all combination of list with last element, I would like to write simple:
for i in range(l, 0, -1): yield " ".join(src[0:i-1].append(src[-1]))
But I've got:
TypeError. Instead following code with intermediate variable is used:
for i in range(l, 0, -1): sub = src[0:i-1] sub.append(src[-1]) yield " ".join(sub)
Correct me please if I'm wrong
Hm, maybe replace: