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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?
Learn how to slice an array in Python using colons and square brackets. See examples of slicing with different start, end and step arguments.
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1] in Python with Examples - Guru99
Whenever a programmer defines [::-1], it suggests that the program has to traverse from start to end in a given list. You can do indexing in python, which helps to slice and dice an iterable sequence such as a list or string. What is [::-1] in Python? What is the type of 1 in Python? How to perform Indexing in Python?
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What Does 'do' Do in Python - Online Tutorials Library
Discover the functionality and purpose of the 'do' statement in Python programming. Learn how it can be utilized effectively in your code.
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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 is the meaning of "int(a[::-1])" in Python? - Stack Overflow
So, when you do a[::-1], it starts from the end towards the first taking each element. So it reverses a. This is applicable for lists/tuples as well. Example - Then you convert it to int and then back to string (Though not sure why you do that) , that just gives you back the string.
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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.
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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 - What is the difference between i = i + 1 and i += 1 in a 'for ...
But to explicitly write into the same memory you could use i[:] = i+1 (but it's generally better to use += or the out -argument of several ufuncs).