rule object is not iterable

问题:
exceptions.TypeError: 'Rule' object is not iterable

原因:

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rules =(
Rule(SgmlLinkExtractor(allow = ()) ,callback = 'parse_item')
)

不是可以迭代的对象

修改为:

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rules =(Rule(SgmlLinkExtractor(allow = ()) ,callback = 'parse_item'),)