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What does [:-1] mean/do in python? - Stack Overflow
Sometimes -1 is used to express the end of an array of things. My guess is this means to read from beginning to the end of the line (but just a guess, hence not an official answer). I'm not sure it's a dup, because of that "in the context of…" part—which is the part that you and, especially, Pavel Anossov answered.
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Python Slicing – How to Slice an Array and What Does [::-1] Mean?
Here's an example array in Python: We created an array of integer values from 1 to 5 here. We also accessed the second value by using square brackets and its index in the order, which is 1. Let's say you want to slice a portion of this array and assign the slice to another variable. You can do it using colons and square brackets.
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1] in Python with Examples - Guru99
There are two ways to represent 1 in python as described below: –. It can be represented in a simple square bracket with no colon and another method with double colon syntax. An iterable sequence such as a list or string can be parsed to item level using [] brackets. Within the [] brackets, one has to provide different indexes.
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What is the meaning of "int(a[::-1])" in Python? - Stack Overflow
So, if you give a -1 index, it translates to len (a)-1 index. And if you give -x as the step count, then it would step every x'th value from the start index, till the stop index in the reverse direction. For example. This would return. Note, that it doesn't return 4321 because, the stop index is not included. Now in your case,
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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. It adds two values and assigns the sum to a variable (left operand). Let’s look at three instances to have a better idea of how this operator works. 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.
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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]. The [::-1] reverses the order. In a similar way, we can slice strings like this.
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Python List Slicing - GeeksforGeeks
Python list slicing is fundamental concept that let us easily access specific elements in a list. In this article, we’ll learn the syntax and how to use both positive and negative indexing for slicing with examples. Example: Get the items from a list starting at position 1 and ending at position 4 (exclusive). Parameters:
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syntax - What does :-1 mean in python? - Stack Overflow
It is list indexing, it returns all elements [:] except the last one -1. Similar question here. For example, It works like this. It's called slicing, and it returns everything of message but the last element. Best way to understand this is with example: You can always replace -1 with any number: The last index is not included. It's called slicing.
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Python range() Function - W3Schools
Create a sequence of numbers from 0 to 5, and print each item in the sequence: The range() function returns a sequence of numbers, starting from 0 by default, and increments by 1 (by default), and stops before a specified number. Optional. An integer number specifying at which position to start. Default is 0. Required.