Here, we have first got the length of the list usinglen(my_list), and then usinglist_len - n, we have minus the number of elements we want to remove from the end of the list Next, we removed the last 2 elements
In the program, we delete elemetns with del. del words[0] del words[-1] We delete the first and the last element of the list. vals = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10] del vals[0:4] Here, we delete a range of integers. ...
最简单粗暴的获取方法some_list[-n] some_list[-n]可以获取列表倒数第n个元素。some_list[-1]获取最后一个元素,some_list[-2]获取倒数第二个,一直到some_list[-len(some_list)],这个给你提供了第一个元素 >>> some_list = [1, 2, 3] >>> some_list[-1] = 5 # Set the last element >>> ...
Updated animals list: ['cat', 'dog', 'guinea pig', 'dog'] Here, only the first occurrence of element'dog'is removed from the list. Example 3: Deleting element that doesn't exist # animals listanimals = ['cat','dog','rabbit','guinea pig'] # Deleting 'fish' elementanimals.remove(...
lastElement = newList.pop() * 弹出列表索引为index的元素 popedElement = newList.pop(index) * 根据值删除元素 newList.remove('sdfsafdsa') remove() 只删除第一个指定的值。如果要删除的值可能在列表中出现多次,需要使用循环来判断是否删除了所有这样的值。
# 获取列表中的第一个元素first_element=my_list[0]# 获取列表中的最后一个元素last_element=my_list[-1]# 向列表中添加一个元素my_list.append(6)# 从列表中移除一个元素my_list.remove(3)# 判断一个元素是否在列表中if4inmy_list:print("4 is in the list")else:print("4 is not in the list...
Method-2: Remove the first element of the Python list using the pop() method Thepop()method is another way to remove an element from a list in Python. By default,pop()removes and returns the last element from the list. However, we can also specify the index of the element to be re...
Insert an item at a given position. The first argument is the index of the element before which to insert, soa.insert(0,x)inserts at the front of the list, anda.insert(len(a),x)is equivalent toa.append(x). list.remove(x) 删除list的第一个x数据 ...
· remove()函数根据元素的值来删除元素。· clear()函数清空列表。#Deleting elements from the listfruits = ['Apple', 'Guava', 'Banana','Orange', 'Kiwi']#del() function del fruits[3] #delete element at index 4 print(fruits)Output:['Apple', 'Guava', 'Banana', 'Kiwi']#pop()fun...
Map returns an interator from a list y = map(lambda i: i ** 2, list) decorator装饰器 装饰器是把一个要执行的函数包含在wrapper函数里面,并且在要执行的函数前后去执行代码 classmethod和staticmethod staticmethod不需要已经实例化的类的函数来作为输入,可以传入任何东西。method中不使用self就不会改变class ...