23 lines
1.1 KiB
Python
23 lines
1.1 KiB
Python
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from itertools import dropwhile, islice
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if __name__ == '__main__':
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words = ["#look", "#into", "#my", "eyes", "look", "into", "my", "eyes",
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"the", "eyes", "the", "eyes", "the", "eyes", "not", "around", "the",
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"eyes", "don't", "look", "around", "the", "eyes", "look", "into",
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"my", "eyes", "you're", "under"]
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# 想要对可迭代对象进行过滤，也可以使用dropwhile函数,比如这里我想过滤掉前几行有#的东西
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for i in dropwhile(lambda x : x.startswith('#'), words):
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print(i)
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# dropwhile会在迭代时对函数进行匹配，将符合条件的值丢弃，直到出现第一个符合条件的值后停止工作返回所有剩余内容
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# 如果你知道需要跳过几个元素，那可以直接用islice进行切片操作来过滤
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items = ['a', 'b', 'c', 1, 2, 3]
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# None表示[3:]
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for i in islice(items, 3, None):
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print(i)
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# 当然，使用列表的过滤方法也可以删除一些不要的东西，但是这样的删除是全局的，而不是仅在开头生效
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