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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 the percentage sign mean in Python [duplicate]
What does the percentage sign mean? It's an operator in Python that can mean several things depending on the context. A lot of what follows was already mentioned (or hinted at) in the other answers but I thought it could be helpful to provide a more extensive summary. % for Numbers: Modulo operation / Remainder / Rest
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The += Operator In Python - A Complete Guide - AskPython
Congratulations! You just learned about the ‘+=’ operator in python and also learned about its various implementations. Liked the tutorial? In any case, I would recommend you to have a look at the tutorials mentioned below: The “in” and “not in” operators in Python; Python // operator – Floor Based Division; Python Not Equal operator
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syntax - What do >> and << mean in Python? - Stack Overflow
The other case involving print >>obj, "Hello World" is the "print chevron" syntax for the print statement in Python 2 (removed in Python 3, replaced by the file argument of the print() function).Instead of writing to standard output, the output is passed to the obj.write() method. A typical example would be file objects having a write() method. . See the answer to a more recent question ...
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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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How to Use axis=0 and axis=1 in Pandas? - GeeksforGeeks
Matplotlib is a library in Python and it is numerical – mathematical extension for NumPy library. It is an amazing visualization library in Python for 2D plots of arrays and used for working with the broader SciPy stack. Matplotlib.axis.Axis.set_tick_params() Function The Axis.set_tick_params() func
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syntax - What does += mean in Python? - Stack Overflow
The problem with the later is (aside from the leading-space), depending on the Python implementation, the Python interpreter will have to make a new copy of the string in memory every time you append (because strings are immutable), which will get progressively slower the longer the string to append is..
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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: