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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?
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?
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Meaning of list [-1] in Python - Stack Overflow
[-1] means the last element in a sequence, which in this is case is the list of tuples like (element, count), order by count descending so the last element is the least common element in the original collection. Possible duplicate: stackoverflow.com/questions/509211/…
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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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python - What does [:] mean? - Stack Overflow
It is an example of slice notation, and what it does depends on the type of population. If population is a list, this line will create a shallow copy of the list. For an object of type tuple or a str, it will do nothing (the line will do the same without [:]), and for a (say) NumPy array, it will create a new view to the same data.
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syntax - What do >> and << mean in Python? - Stack Overflow
Perhaps an example would help, type a series of these in Python: print bin(1), print bin(1 << 1), print bin(17), print bin(17 >> 1) and so on. You can see how it works without explanations. It is an answer to the context the OP provided (and thus known to OP) and not to the question asked.
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Python Operators - W3Schools
Operators are used to perform operations on variables and values. In the example below, we use the + operator to add together two values: Python divides the operators in the following groups: Arithmetic operators are used with numeric values to perform common mathematical operations: Assignment operators are used to assign values to variables:
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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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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.