Python-algos: Sentence Reversal

def rev_word3(s):

words = []
length = len(s)
spaces = [' ']
i = 0
while i < length:
if s[i] not in spaces:
word_start = i

while i < length and s[i] not in spaces:
i += 1
words.append(s[word_start:i])
i += 1
return " ".join(reversed(words))

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