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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!
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Python Slicing – How to Slice an Array and What Does [::-1] Mean?
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 index, which is 2 will be added to the slice.
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Python Operators Cheat Sheet - LearnPython.com
Python Comparison Operators. Comparison operators are used to compare two values.They return a Boolean value (True or False) based on the comparison result.These operators are often used in conjunction with if/else statements in order to control the flow of a program. For example, the code block below allows the user to select an option from a menu:
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Operators and Expressions in Python
That evaluates to 1, which is truthy. At that point, Python stops the evaluation because it already knows that the entire expression is truthy. Consequently, Python returns 1 as the value of the expression and never evaluates the remaining operands, f(2) and f(3). You can confirm from the output that the f(2) and f(3) calls don’t occur.
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Python Operators - W3Schools
Sets each bit to 1 if both bits are 1: x & y: Try it » | OR: Sets each bit to 1 if one of two bits is 1: x | y: Try it » ^ XOR: Sets each bit to 1 if only one of two bits is 1: x ^ y: Try it » ~ NOT: Inverts all the bits ~x: Try it » << Zero fill left shift: Shift left by pushing zeros in from the right and let the leftmost bits fall off: x ...
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syntax - What does :-1 mean in python? - Stack Overflow
What does :-1 mean in python? [duplicate] Ask Question Asked 12 years, 4 months ago. Modified 2 years, 8 months ago. Viewed 162k times 33 . This question already has answers here: How slicing in Python works (38 answers) Closed 2 years ago. I'm trying to port some Python code to C, but I came across this line and I can't figure out what it ...
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The += Operator In Python - A Complete Guide - AskPython
In this lesson, we will look at the += operator in Python and see how it works with several simple examples. The operator ‘+=’ is a shorthand for the addition assignment operator . It adds two values and assigns the sum to a variable (left operand).
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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.
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"x += 1" vs "x = x + 1" : r/learnpython - Reddit
For many types of objects, x += y will modify the object referred to by x in-place, whereas x = x + y will create a new object and reassign x to it. This distinction is important if you still have another reference to the object somewhere. For example, the following two pieces of code are the same except for the a += b/a = a + b line, but they produce slightly different results:
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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. 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.