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!

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

This means 2 - 1 which is 1 so the value at this index, which is 2 will be added to the slice. This goes on reversed until it gets to the end of the array which is index 0 . The sliced array results in values of 3, 2, and 1.

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[::-1] in Python with Examples - Guru99

Role of slicing in Python In simpler words, a slice means to cut something. It allows dicing a list in python. Here, how slicing is important in Python: It allows access to specific elements of an iterable list or a string. It also helps in deleting and modifying the string or

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What Does :: Mean in Python? Operator Meaning for Double Colon

You can use the double colon (::) in Python to slice or extract elements in a collection such as a list or string.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

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syntax - What do >> and << mean in Python? - Stack Overflow

128 >> 1 64 = 01000000 x << y Returns x with the bits shifted to the left by y places (and new bits on the right-hand-side are zeros). This is the same as multiplying x by 2**y. 64 << 1 128 = 10000000 PD: In python 3.9 the operator " | "Applied to dictionaries

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regex - python regular expression "\1" - Stack Overflow

\1 is equivalent to re.search(...).group(1), the first parentheses-delimited expression inside of the regex. It's also, fun fact, part of the reason that regular expressions are significantly slower in Python and other programming languages than required to be by CS theory.

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Python Operators - W3Schools

Parentheses has the highest precedence, meaning that expressions inside parentheses must be evaluated first: print((6 + 3) - (6 + 3)) ... Python, PHP, Bootstrap, Java, XML and more. Tutorials Exercises Certificates Services Menu × Log in +1 ...

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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 List Slicing - GeeksforGeeks

In Python, lists are dynamic which means that they allow further adding elements unlike many other languages. In this article, we are going to explore different methods to add elements in a list. For example, let's add an element in the list using append() method:Pythona = [1, 2, 3] a.append(4) prin

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Demystifying `python ::1` Meaning: A Comprehensive Guide

In the realm of Python programming, certain syntax elements might seem a bit cryptic at first glance. 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 ...

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