return的位置不同导致不同的结果（来自夜曲编程）
def getword(words):
word = ""
for i in words:
word = word + i
return word
print(getword(["ye","qu"]))#如果return在循环内部，循环只进行一次
def getword(words):
word = ""
for i in words:
word = word + i
return word
print(getword(["ye","qu"]))
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