嵌套列表中的负列表索引(Negative List Indexing In a Nested List) 也可以通过负索引访问嵌套列表。 负索引从列表末尾开始倒数。 因此,L[-1]是指最后一项,L[-2]是倒数第二,依此类推。 嵌套列表中项目的负索引如下所示: # Example: Access nested list items by Negative Index L = ['a', 'b', ['cc...
字符串是python当中最常用的数据类型,我们用它来处理文本内容,字符串是字符的有序集合,可以使用一对单引号或一对双引号,或者3对双引号来创建。Python 字符串负索引(Negative Indexing)。 原文地址: Python 字…
Negative Indexing: Python also supports negative indexing, which starts from the end of the list. This means the last element can be accessed with-1, the second to last with-2, and so forth. In thecolorslist,colors[-1]returns'blue', the last element. ...
1. 通过切片操作,我们成功获取了列表my_list的前10个元素。 负索引(Negative Indexing) 除了使用正整数索引来获取列表的元素,Python还支持使用负整数索引。负索引表示从列表末尾开始计数,例如,索引-1表示最后一个元素,索引-2表示倒数第二个元素,以此类推。 要获取列表的最后10个元素,我们可以使用负索引来指定切片操...
Negative List Indexing>>> a[-1] 'corge' >>> a[-2] 'quux' >>> a[-5] 'bar' Slicing also works(可切片). If a is a list, the expression a[m:n] returns the portion of a from index m to, but not including, index n:>>> a = ['foo', 'bar', 'baz', 'qux', 'quux'...
index = 0 1 2 3# 'o' is inserted at index 3 (4th position)vowel.insert(3, 'o')print('List:', vowel)# Output: List: ['a', 'e', 'i', 'o', 'u'] index 0 1 2 3 4 4.remove():从列表中删除一个项目。 # create a list ...
Negative indexing means start from the end-1 refers to the last item, -2 refers to the second last item etc.Example Print the last item of the list: thislist = ["apple", "banana", "cherry"] print(thislist[-1]) Try it Yourself » ...
Virtually everything about indexing works the same for tuples.You can also use a negative index, in which case the count starts from the end of the list:Negative List Indexing Index -1 corresponds to the last element in the list, while the first element is -len(words), as shown below...
Another form of concatenation is with the application of thejoinmethod. To use the join method, we have to call it on the string that’ll be used for joining. In this case, we’re using a string with a space in it. The method receives a list of strings and returns one string with...
Python review(list, dictionary, tuple) List xs = [3,1,2]# Create a listprint(xs, xs[2])# Prints "[3, 1, 2] 2"print(xs[-1])# Negative indices count from the end of the list; prints "2"xs[2] ='foo'# Lists can contain elements of different typesprint(xs)# Prints "[3,...