What does [:-1] mean/do in python? - Stack Overflow

Working on a python assignment and was curious as to what [:-1] means in the context of the following code: instructions = f.readline()[:-1] Have searched on here on S.O. and on Google but to no avail. Would love an explanation!

訪問 visit
copy 已複製
copy copy

查看快取版本

您的搜尋與此結果

  • 搜尋詞 出現在結果中: 1 meaning in python
  • 該網站符合您的其中一個或多個搜尋詞
  • 其他包含您的搜尋詞的網站鏈接到此結果
  • 結果的語言是 中文 (香港)
Python Slicing – How to Slice an Array and What Does [::-1] Mean?

Here, we specify a start of index 2, no end, and a step of -1. Slicing here will start from index 2 which is 3. The negative steps mean the next value in the slice will be at an index smaller than the previous index by 1. This means 2 - 1 which is 1 so the value at this

訪問 visit
copy 已複製
copy copy

查看快取版本

您的搜尋與此結果

  • 搜尋詞 出現在結果中: 1 meaning in python
  • 該網站符合您的其中一個或多個搜尋詞
  • 其他包含您的搜尋詞的網站鏈接到此結果
  • 結果的語言是 中文 (香港)
[::-1] in Python with Examples - Guru99

Role of slicing in Python In simpler words, a slice means to cut something. It allows dicing a list in python. Here, how slicing is important in Python: It allows access to specific elements of an iterable list or a string. It also helps in deleting and modifying the string or

訪問 visit
copy 已複製
copy copy

查看快取版本

您的搜尋與此結果

  • 搜尋詞 出現在結果中: 1 meaning in python
  • 該網站符合您的其中一個或多個搜尋詞
  • 其他包含您的搜尋詞的網站鏈接到此結果
  • 結果的語言是 中文 (香港)
What Does 'do' Do in Python - Online Tutorials Library

Slicing in Python gets a sub-string from a string. The slicing range is set as parameters i.e. start, stop and step. For slicing, the 1st index is 0. For negative indexing, to display the 1st element to last element in steps of 1 in reverse order, we use the [::-1]. The [::-1

訪問 visit
copy 已複製
copy copy

查看快取版本

您的搜尋與此結果

  • 搜尋詞 出現在結果中: 1 meaning in python
  • 該網站符合您的其中一個或多個搜尋詞
  • 其他包含您的搜尋詞的網站鏈接到此結果
  • 結果的語言是 中文 (香港)
What is the meaning of "int(a[::-1])" in Python? - Stack Overflow

To get the same result , you cannot fill out all three, you can put <start> as len(a)-1, but there is no <stop> index you can put to get the first element. Example - a[len(a)-1::-1].This is because <stop> index is exclusive, that is the element at that index is not taken in, also -1 means the last element , so there is no index that can be used to include the first element , other than leaving ...

訪問 visit
copy 已複製
copy copy

查看快取版本

您的搜尋與此結果

  • 搜尋詞 出現在結果中: 1 meaning in python
  • 該網站符合您的其中一個或多個搜尋詞
  • 其他包含您的搜尋詞的網站鏈接到此結果
  • 結果的語言是 中文 (香港)
What is :: (double colon) in Python when subscripting sequences?

s = slice(1, 2, 3) assert s.start == 1 assert s.stop == 2 assert s.step == 3 This is notably used in Numpy to slice multi-dimensional arrays in any direction. Of course, any sane API should use ::3 with the usual "every 3" semantic. The related Ellipsis is covered

訪問 visit
copy 已複製
copy copy

查看快取版本

您的搜尋與此結果

  • 搜尋詞 出現在結果中: 1 meaning in python
  • 該網站符合您的其中一個或多個搜尋詞
  • 其他包含您的搜尋詞的網站鏈接到此結果
  • 結果的語言是 中文 (香港)
Python Operators - W3Schools

Parentheses has the highest precedence, meaning that expressions inside parentheses must be evaluated first: print((6 + 3) - (6 + 3)) ... Python, PHP, Bootstrap, Java, XML and more. Tutorials Exercises Certificates Services Menu × Log in +1 ...

訪問 visit
copy 已複製
copy copy

查看快取版本

您的搜尋與此結果

  • 搜尋詞 出現在結果中: 1 meaning in python
  • 該網站符合您的其中一個或多個搜尋詞
  • 其他包含您的搜尋詞的網站鏈接到此結果
  • 結果的語言是 中文 (香港)
The += Operator In Python - A Complete Guide - AskPython

In this lesson, we will look at the += operator in Python and see how it works with several simple examples. The operator ‘+=’ is a shorthand for the addition assignment operator. 1. Adding Two Numeric Values With += Operator In the code mentioned below, we ...

訪問 visit
copy 已複製
copy copy

查看快取版本

您的搜尋與此結果

  • 搜尋詞 出現在結果中: 1 meaning in python
  • 該網站符合您的其中一個或多個搜尋詞
  • 其他包含您的搜尋詞的網站鏈接到此結果
  • 結果的語言是 中文 (香港)
Python String question: What does [::-1] mean? - Sololearn

In Python, the syntax `[::-1]` is used to reverse a string.It is known as string slicing with a step value of -1. Let's break down how it works: - The first colon `:` indicates that we want to slice the entire string. - The second colon `:` indicates the step value. - The `-1` as ...

訪問 visit
copy 已複製
copy copy

查看快取版本

您的搜尋與此結果

  • 搜尋詞 出現在結果中: 1 meaning in python
  • 該網站符合您的其中一個或多個搜尋詞
  • 其他包含您的搜尋詞的網站鏈接到此結果
  • 結果的語言是 中文 (香港)
python - Use and meaning of "in" in an if statement? - Stack Overflow

So, in JS, 1 in d will be true for an object if it has a member or method named '1', but in Python, it's up to your class what it means—Python will call d.__contains__(1), then, if that fails, it tries to use your object as an utterable (by calling its __iter__, and, if that0

訪問 visit
copy 已複製
copy copy

查看快取版本

您的搜尋與此結果

  • 搜尋詞 出現在結果中: 1 meaning in python
  • 該網站符合您的其中一個或多個搜尋詞
  • 其他包含您的搜尋詞的網站鏈接到此結果
  • 結果的語言是 中文 (香港)