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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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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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What Does :: Mean in Python? Operator Meaning for Double Colon
In this article, you'll learn the syntax and how to use :: to slice a list in Python. You'll also learn how to use the parameters associated with this method of slicing. Here's what the syntax for the double colons looks like: In the syntax above: collection denotes the data collection (list, string, array, and so on).
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python - What does -1 mean in numpy reshape? - Stack Overflow
Usually, array[-1] means the last element. But what does -1 mean here? It is quite simple, -1 means 'whatever it takes' to flatten. So, in the above example, a.reshape (2,-1) would mean 2*4, a.reshape (4,-1) would mean 4*2, a.reshape (2,2,-1) would mean 2,2,2 and just a.reshape (-1) would mean 8.
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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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What is the meaning of "int(a[::-1])" in Python? - AskPython
Therefore, int (a [::-1]) refers to slicing a string variable named “a”, which has numbers in the form of strings in it and then converting the sliced string literal into integer literals explicitly by using the int () function. If the variable “a” has characters or alphabets, then the above statement will raise a ValueError.
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regex - python regular expression "\1" - Stack Overflow
Can anyone tell me what does "\1" mean in the following regular expression in Python? \1 is equivalent to re.search(...).group(1), the first parentheses-delimited expression inside of the regex.
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What is Python? Executive Summary | Python.org
Python is an interpreted, object-oriented, high-level programming language with dynamic semantics. Its high-level built in data structures, combined with dynamic typing and dynamic binding, make it very attractive for Rapid Application Development, as well as for use as a scripting or glue language to connect existing components together.
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Demystifying `python ::1` Meaning: A Comprehensive Guide
One such element is the use of ::1 in Python. This notation is related to Python's powerful slicing capabilities, which are fundamental for working with sequences like strings, lists, and tuples. Understanding what ::1 means and how to use it effectively can significantly enhance your Python programming skills.