defreverseString(self, s):""" :type s: List[str] :rtype: None Do not return anything, modify s in-place instead. """i =0# 第一个指针,从首部遍历j =len(s) -1# 第二个指针,从尾部遍历whilej > i:# 如果j>i就一直循环,直到2个指针相遇s[i], s[j] = s[j], s[i]# 交换2个...
| Raises IndexError if list is empty or index is out of range. | | remove(...) | L.remove(value) -> None -- remove first occurrence of value. | Raises ValueError if the value is not present. | | reverse(...) | L.reverse() -- reverse *IN PLACE* | | sort(...) | L.so...
reverse() Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: 'str' object has no attribute 'reverse' Also, the list reverse method is an in-place operation. Meaning it doesn't return a new list to us, instead it modifies the original list....
Python has two basic function for sorting lists:sortandsorted. Thesortsorts the list in place, while thesortedreturns a new sorted list from the items in iterable. Both functions have the same options:keyandreverse. Thekeytakes a function which will be used on each value in the list being ...
secret_messages =['SOS','X marks the spot','Look behind you']message_reverse = secret_messages[-1]# 'Look behind you'first_and_last = secret_messages[,-1]# ['SOS', 'Look behind you']2.2 更新列表内容 插入元素：append()、extend()、insert()在列表这片神秘的土地上，添加新元素就像在...
print list[2]; 1. 2. 3. 4. 5. 6. 7. 8. 以上实例的输出结果是: Value available at index 2 : 1997 New value available at index 2 : 2001 使用append()方法来添加列表项 >>> s=['physics','chemistry'] >>> s.append("wangtao") ...
def sort(self, key=None, reverse=False): # real signature unknown; restored from __doc__ """ L.sort(key=None, reverse=False) -> None -- stable sort *IN PLACE* """ pass 1. 2. 3. 样例: list = [1,2,44,22,3,4] list.sort() #顺序排序显示 ...
>>> sample_list=[initial_value for i in range(10)] >>> print sample_list [0, 0, 0, 0, 0, 0, 0, 0, 0, 0] 访问列表 访问单个元素 >>> num=[0,1,2,3,4,5,6,7] >>> num[3] 3 >>> num=[0,1,2,3,4,5,6,7] ...
列表(List):有序集合,可以随时添加和删除其中的元素。 提取元素的方法 通过索引提取:可以直接通过列表的索引来访问字典。 通过键提取:在获取到特定字典后,可以通过键来获取对应的值。 遍历提取:通过循环遍历整个列表,对每个字典进行操作。 示例代码 假设我们有以下字典列表,代表一些学生的成绩信息: 代码语言:txt 复制...
[1, 'New', 'Python', 4.5, 6]# 查找元素index=my_list.index('Python')print(index)# 输出: 2# 统计元素出现次数count=my_list.count(4.5)print(count)# 输出: 1# 排序列表my_list.sort()print(my_list)# 输出: [1, 4.5, 6, 'New', 'Python']# 反转列表my_list.reverse()print(my_list)...