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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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]. The [::-1

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Python Operators - W3Schools

W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more.

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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. of a program.

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string - What does n [::-1] means in Python? - Stack Overflow

I have a string n = "abc". I want to reverse it and found a solution like n[::-1]. What is the meaning of all 3 arguments? Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand ...

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python - Slicing: What does [:,:-1] and [:,-1] mean? - Stack Overflow

I have an assignment where they slice the data we get like a_list[:,:-1], a_list[:,-1] The data in the csv file looks like this (first two lines): 6.7240e-02,0.0000e+00,3.2400e+00,0.0000

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-= Subtraction Assignment — Python Reference (The Right Way) 0.1 ...

Python Reference (The Right Way) Docs »-= Subtraction Assignment Edit on GitHub-= Subtraction Assignment Description Subtracts a value from the variable and assigns the result to that variable. Syntax A -= B A Any valid object ...

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Operators and Expressions in Python

In Python, operators are special symbols, combinations of symbols, or keywords that designate some type of computation. You can combine objects and operators to build expressions that perform the actual computation. So, operators are the building blocks of expressions.

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"x += 1" vs "x = x + 1" : r/learnpython - Reddit

In this case I would highly prefer the latter, which is the Pythonic convention. However, they aren't exactly the same. The difference is that in x = x + 1 the magic method __add__ is called, while in x += 1 the magic method __iadd__ is called, and these can be implemented differently (though __iadd__ typically calls __add__). ...

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Modulo operator (%) in Python - GeeksforGeeks

Modulo operator (%) in Python gives the remainder when one number is divided by another. Python allows both integers and floats as operands, unlike some other languages. It follows the Euclidean division rule, meaning the remainder always has the same sign as the divisor.

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