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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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BetaWhat does "for x in A[1:] mean? There are two parts to this. First, let's consider A[1:], which is slice notation on a list or array. Consider the following list: A = [3,4,5,6] In this example A[0] is 3 and A[1] is 4 and so on. When you use the : that can mean take everything or everything
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Beta[1:5] for displaying values between 1 inclusive and 5 exclusive i.e 1-4 [start:end] basically used in array for slicing , understand bracket accept variable that mean value or key to display, and " : " is used to limit or slice the entire array into packets .
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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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BetaSets 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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BetaCongratulations! 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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BetaMost of these operators are self-explanatory, but a few are somewhat tricky. The floor division operator ( //), for example, returns the integer portion of the division between two numbers. The modulo operator ( %) is also uncommon: it returns the remainder of an integer division, i.e. what remains when you divide a number by another.When dividing 11 by 4, the number 4 divides “perfectly ...
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BetaIntroduction. Slicing is an important concept in Python that allows us to select specific elements from a list, tuple or string. It is done using the slicing operator [:]. The operator takes two arguments separated by a colon. The first argument specifies the index of the element where the slice starts and the second argument specifies the index of the element where the slice ends.
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BetaDescription¶. Subtracts a value from the variable and assigns the result to that variable.
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