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 mean 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 mean 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 mean 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 mean 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

Python uses 1 to perform indexing and slicing of lists, strings, and dictionaries. There are three sequence types in python. An iterable sequence can be either list, strings, or dictionaries. These are built-in types of objects. Python supports negative as well 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 mean 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)
statistics mean() function – Python | GeeksforGeeks

The mean() function from Python’s statistics module is used to calculate the average of a set of numeric values. It adds up all the values in a list and divides the total by the number of elements. For example, if we have a list [2, 4, 6, 8], the mean would be (2 + 4 + 6 + 8) / 4 = 5.0..

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 mean 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 mean 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)
syntax - What do >> and << mean in Python? - Stack Overflow

128 >> 1 64 = 01000000 x << y Returns x with the bits shifted to the left by y places (and new bits on the right-hand-side are zeros). This is the same as multiplying x by 2**y. 64 << 1 128 = 10000000 PD: In python 3.9 the operator " | "Applied to dictionaries

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 mean 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

W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more.

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 mean 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.

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 mean 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)