What is the slice expression that gives every third character of string s, starting with the last character and proceeding backward to the first?
Question
What is the slice expression that gives every third character of string s, starting with the last character and proceeding backward to the first?
Solution
The slice expression that gives every third character of a string s, starting with the last character and proceeding backward to the first in Python is s[::-3].
Here's how it works:
- The first colon
:is used to indicate the start and end indices. Leaving it blank means we want to include all elements. - The second colon
:is used to indicate the step, which is the number of indices between elements. In this case, we want every third element, so we use3. - The negative sign
-before the3means we want to step in the reverse direction, starting from the end and going towards the start.
So, s[::-3] will give us every third character of the string s, starting from the end and going towards the start.
Similar Questions
(i) Without using string slicing operations, create a function which takes in a string, reverse(string), and returns a new string in the reverse order.
写一个函数slice_from(string: str, start: int, end: int) -> strstring它返回从索引start到（但不包括）索引的字符end。请注意，包含起始索引处的字符但排除结束索引处的字符这一特性是默认的切片行为。写一个函数reverse_string(string: str) -> strstring它以相反的顺序返回字符。slice_from要获得and任务的学分reverse_string，您必须仅使用单个切片语句。例子>>> slice_from("abcdefghi", 3, 7)'defg'>>> reverse_string("abcd")'dcba'
What is a string slice? How is it useful?
Write a program to get the last part of a string before a specified character.Note: Specified characters are "/" and "-"Input format :Input consists of a string.Output format :The first line of the output depends on the "/" character.The second line of the output depends on the "-" character.Sample test cases :Input 1 :https:/admin.app.placementseason.com-examlyOutput 1 :https:https:/admin.app.placementseason.comInput 2 :https://www.onlinegdb.com/online_python_compilerOutput 2 :https://www.onlinegdb.comhttps://www.onlinegdb.com/on
What is a correct syntax to return the first character in a string?
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.