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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 - 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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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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Python List Slicing - GeeksforGeeks
Python 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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-= Subtraction Assignment — Python Reference (The Right Way) 0.1 ...
Python Reference (The Right Way) latest Introduction; Definitions; Coding Guidelines; Fundamental Data Types; Built-In Functions; Comprehensions and Generator Expression; Container Data Access; Operators; Statements; Other Objects; Double Underscore Methods and Variables; Exceptions; Constants ...
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syntax - What does :-1 mean in python? - Stack Overflow
I'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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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?
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python - What is the difference between i = i + 1 and i += 1 in a 'for ...
As already pointed out, b += 1 updates b in-place, while a = a + 1 computes a + 1 and then assigns the name a to the result (now a does not refer to a row of A anymore). To understand the += operator properly though, we need also to understand the concept of mutable versus immutable objects. Consider what happens when we leave out the .reshape:
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Operators and Expressions in Python
In this example, you use the Python equality operator (==) to compare two numbers.As a result, you get True, which is one of Python’s Boolean values.. Speaking of Boolean values, the Boolean or logical operators in Python are keywords rather than signs, as you’ll learn in the section about Boolean operators and expressions.So, instead of the odd signs like ||, &&, and ! that many other ...