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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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BetaHere, 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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BetaSlicing 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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BetaW3Schools 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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BetaPython list slicing is fundamental concept that let us easily access specific elements in a list. In this article, we’ll learn the syntax and how to use both positive and negative indexing for slicing with examples. Example: Get the items from a list starting at position 1 and ending at position 4 (exclusive). Python
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BetaIn 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 the step value means we want to traverse the string in reverse order, moving from the last character to the first character. my_string = "Hello, World!"
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BetaDescription¶. Subtracts a value from the variable and assigns the result to that variable.
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BetaConsequently, 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. A similar behavior appears in an expression with multiple and operators like the following one: Python. x1 and x2 and x3 and... and xn. Copied! This expression is truthy if all the operands are truthy. If at least one operand is falsy, then the expression is also falsy.
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Betawhat does [::-1] mean in python - slicing? 34. How to explain the reverse of a sequence by slice notation a[::-1] 1. How does reversing a string work with string[ : :-1] 2. What does [::-1] actually do in numpy? Hot Network Questions Building the Most Secure Cryptographic Network for a Home Lab – Protocol and Algorithm Recommendations?
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BetaI'm trying to port some Python code to C, but I came across this line and I can't figure out what it means: if message.startswith('<stream:stream'): message = message[:-1] + ' />' I understand that if ' message starts with <stream:stream then something needs to be appended.
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