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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!
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Python Slicing – How to Slice an Array and What Does [::-1] Mean? - freeCodeCamp.org
The sliced array results in values of 3, 2, and 1. What does [::-1] mean? Have you seen this expression anywhere in Python before? Well, here's what it means: there's no start index specified, nor an end index, only a negative step of -1.
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string - What does n [::-1] means in Python? - Stack Overflow
I have a string n = "abc". I want to reverse it and found a solution like n[::-1]. What is the meaning of all 3 arguments? Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand ...
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What is :: (double colon) in Python when subscripting sequences?
TL;DR This visual example will show you how to a neatly select elements in a NumPy Matrix (2 dimensional array) in a pretty entertaining way (I promise). Step 2 below illustrate the usage of that "double colons" :: in question. (Caution: this is a NumPy array ...
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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
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>> operator in Python - Stack Overflow
What does the >> operator do? For example, what does the following operation 10 >> 1 = 5 do? and << are the Right-Shift and Left-Shift bit-operators, i.e., they alter the binary representation of the number (it can be used on other data structures as well, but Python ...
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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].
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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 ...
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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 ...