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What does [:-1] mean/do in python? - Stack Overflow
Working on a python assignment and was curious as to what [:-1] means in the context of the following code: instructions = f.readline()[:-1] Have searched on here on S.O. and on Google but to no avail. Would love an explanation! Matt. Sometimes -1 is used to express the end of an array of things.
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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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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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Negative Indexing in Python List – How to Use “-1” Parameter
In Python, objects are “zero-indexed”, which means that position counting starts at zero, 5 elements exist in the list, then the first element (i.e. the leftmost element) holds position “zero”, then After the first element, the second, third and fourth place.
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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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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 ...
After running each for loop, A has not changed, but B has had one added to each element. I actually use the B version to write to a initialized NumPy array within a for loop. Do you realize that you are iterating on the rows of the array, not the individual elements? How is it possible that question from yesterday got 78 upvotes?
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Python Operators Cheat Sheet - LearnPython.com
In this cheat sheet, we will cover every one of Python’s operators: Arithmetic operators. Assignment operators. Comparison operators. Logical operators. Identity operators. Membership operators. Bitwise operators. Additionally, we will discuss operator precedence and its significance in Python.
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Python String - GeeksforGeeks
Strings in Python are sequences of characters, so we can access individual characters using indexing. Strings are indexed starting from 0 and -1 from end. This allows us to retrieve specific characters from the string. Note: Accessing an index out of range will cause an IndexError.