一次性获取多个元素，列表分片方法slice
一次性获取多个元素，列表分片方法slice>>> member
['小甲鱼', '小布丁']
>>> member
['牡丹', '小甲鱼', '小布丁', '黑夜']
>>> member
['牡丹']
>>> member
['小甲鱼']
>>> member
['小布丁', '黑夜']
>>> member[:]
['牡丹', '小甲鱼', '小布丁', '黑夜']
>>> member2=member[:]
>>> member2
['牡丹', '小甲鱼', '小布丁', '黑夜']
>>>
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