re.sub 返回一个字符串，因此将代码更改为以下内容将得到结果：
def removeComments(string):
string = re.sub(re.compile("/\*.*?\*/",re.DOTALL ) ,"" ,string) # remove all occurrences streamed comments (/*COMMENT */) from string
string = re.sub(re.compile("//.*?\n" ) ,"" ,string) # remove all occurrence single-line comments (//COMMENT\n ) from string
return string
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