1.count(self, value, /)
Return number of occurrences of value.
2.extend(self, iterable, /)
?Extend list by appending elements from the iterable.
3.index(self, value, start=0, stop=9223372036854775807, /)
Return first index of value.?Raises ValueError if the value is not present.
4.insert(self, index, object, /)
Insert object before index.
5.pop(self, index=-1, /)
Remove and return item at index (default last).
Raises IndexError if list is empty or index is out of range.
6.remove(self, value, /)
?Remove first occurrence of value.
Raises ValueError if the value is not present.
7.reverse(self, /)
Reverse *IN PLACE*.
1.count：统计指定数值出现的次数
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?2.extend:扩充元素
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3.index:只返回第一个值
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4.insert:插入对象
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5.pop:移除列表中的一个元素
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6.remove:删除指定元素
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7.reverse：反转列表
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