my_list=[1,2,3,4,5]last_item=my_list.pop()my_list.insert(0,last_item)print(my_list)# 输出 [5, 1, 2, 3, 4] 方法二:使用列表切片 Python中,列表是支持切片的,如果要获取列表的最后一个元素,可以使用my_list[-1],如果要获取除了最后一个元素之外的所有元素,可以使用my_list[:-1]。因此,...
In Python, the pop() method is used to remove the last element of the given list and return the removed item. The pop() method can optionally accept an integer argument. It is the index of the element that we want to remove, so if we call exampleList.pop(0), the first element wil...
1. for i in [1,2,3] 2. print i 1. 2. 上面代码中in关键字后面的对象[1,2,3]是一个list,也是一个集合。 但in关键字后面的对象其实不必是一个集合。后面接一个序列对象也是合法的。 例如 1. myrange = MyRange(0, 10) 2. for i in myrange: 3. print i 1. 2. 3. 上面代码中的myra...
Basically, we just get the length of the list and subtract that length by one. That gives us the index of the last item in the list. The main drawback with a solution like this is the time complexity. In order to access the last element, we have to compute some expression which ...
2. Finding Last N Items from a List WhilePython listsdon’t have a built-in mechanism for maintaining a maximum length, we can achieve the same result usinglist slicing. Use this approach when the number of items to retain is relatively small. ...
9、pop([index]) item 删除指定索引元素并且返回该元素,如不传index索引则默认是删除最后一个元素。 >>> a = ["wiki","twitter","google","facebook"] >>> a.pop(1) 'wiki' >>> a ['twitter','google','facebook'] >>> a.pop() 'facebook' >>> a ['twitter','google'] ...
列表(list):是长度可变有序的数据存储器,可通过下标索引取到相应的数据。 元组(tuple):固定长度不可变的顺序容器,访问效率高,适合存储一些长常量数据,可以作为字典的键使用。 集合(set):无序,元素只出现一次,可以自动去重。 字典(dict):长度可变的hash字典容器。存储方式为键值对,可以通过相应的键获取相应的值,ke...
last_two_fruits = fruits[-2:] # 输出: ['kiwi', 'pear'] 使用切片替换部分元素示例: fruits = ['banana', 'orange', 'kiwi', 'pear'] # 将子列表中的'kiwi'和'pear'替换为'mango'和'pineapple' fruits[2:4] = ['mango', 'pineapple'] # 更新后的fruits: ['banana', 'orange', 'mango'...
4.5 index(item) 方法 index(item) 方法在列表中查找指定元素 item,如果找到元素 item,则返回元素 item 的索引;如果找不到,则抛出异常。示例如下: 代码语言:javascript 复制 >>> x = ['www', '5axxw', 'com']>>> x.index('5axxw')1>>> x.index('mooc') Traceback (most recent call last): Fi...
Python List: Exercise - 162 with Solution Write a Python program to find the last occurrence of a specified item in a given list. Pictorial Presentation: Sample Solution: Python Code: # Define a function called 'last_occurrence' that finds the last occurrence of a character 'ch' in a list...