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? - freeCodeCamp.org

Here, we specify a start of index 2, no end, and a step of -1. Slicing here will start from index 2 which is 3. The negative steps mean the next value in the slice will be at an index smaller than the previous index by 1. This means 2 - 1 which is 1 so the value at this

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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 '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].

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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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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. - The `-1` as ...

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What is difference between return 0, return 1 and return -1 in python? - Sololearn

when you return 1, you are basically returning True as the final value of the function while return 0 is basically returning False as the final value of the function. Negative 1 (-1) or any negative numbers that get returned show that the function couldn't find the output wanted (indexing).

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python - Use and meaning of "in" in an if statement? - Stack Overflow

So, in JS, 1 in d will be true for an object if it has a member or method named '1', but in Python, it's up to your class what it means—Python will call d.__contains__(1), then, if that fails, it tries to use your object as an utterable (by calling its __iter__, and, if that0

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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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Python Operators Cheat Sheet | LearnPython.com

1 AND 1 = 1 We end up with 0 , 0 , and 1 , which is then put back together as the binary number 001 – which is, in turn, how the number 1 is represented in binary. This all means that the bitwise operation 5 & 3 results in 1 .

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