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https://stackoverflow.com/questions/15535205/what-does-1-mean-do-...

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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.

https://www.freecodecamp.org/news/python-slicing-how-to-slice-an-...

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Python Slicing – How to Slice an Array and What Does [::-1] Mean?

Slicing an array is the concept of cutting out – or slicing out – a part of the array. How do you do this in Python? I'll show you how in this article. If you like watching video content to supplement your reading, here's a video version of this article as well. What is an Array?

https://www.tutorialspoint.com/what-does-do-in-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]. The [::-1] reverses the order. In a similar way, we can slice strings like this.

http://python-reference.readthedocs.io/en/latest/docs/operators/s...

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-= Subtraction Assignment — Python Reference (The Right Way) 0.1 ...

Subtracts a value from the variable and assigns the result to that variable. A -= B. Any valid object. According to coercion rules. #TODO. Equivalent to A = A - B. #TODO. © Copyright 2015, Jakub Przywóski. Revision 9a3b94e7. Built with Sphinx using a theme provided by Read the Docs.

https://www.w3schools.com/python/python_strings.asp

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Python Strings - W3Schools

Like many other popular programming languages, strings in Python are arrays of bytes representing unicode characters. However, Python does not have a character data type, a single character is simply a string with a length of 1. Square brackets can be used to access elements of the string.

https://www.geeksforgeeks.org/what-does-1-mean-in-numpy-reshape/

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What does -1 mean in numpy reshape? - GeeksforGeeks

When we are unaware of any dimension of the array then we are allowed to have only one "unknown" dimension. This represents that we do not have to specify any number for one of that dimensions in the reshape method. We pass -1 as the value for the unknown dimension, and NumPy will calculate this unknown.

https://realpython.com/python-operators-expressions/

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Operators and Expressions in Python

Python operators enable you to perform computations by combining objects and operators into expressions. Understanding Python operators is essential for manipulating data effectively.

https://stackoverflow.com/questions/14419206/what-does-1-mean-in-...

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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.

https://docs.python.org/3/tutorial/inputoutput.html

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7. Input and Output — Python 3.13.3 documentation

There are several ways to present the output of a program; data can be printed in a human-readable form, or written to a file for future use. This chapter will discuss some of the possibilities. 7.1. Fancier Output Formatting ¶. So far we’ve encountered two ways of writing values: expression statements and the print() function.

https://stackoverflow.com/questions/28535392/what-does-n-1-means-...

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string - What does n [::-1] means in Python? - Stack Overflow

It means, "start at the end; count down to the beginning, stepping backwards one step at a time." The slice notation has three parts: start, stop, step: If the start and stop aren't specified, it means to go through the entire sequence:

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