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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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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. However I can't seem to figure out where it should be appended.
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BetaTo get the same result , you cannot fill out all three, you can put <start> as len(a)-1, but there is no <stop> index you can put to get the first element. Example - a[len(a)-1::-1].This is because <stop> index is exclusive, that is the element at that index is not taken in, also -1 means the last element , so there is no index that can be used to include the first element , other than leaving ...
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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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BetaIf you leave slots empty, there's a default. [:] means: The whole thing. [::1] means: Start at the beginning, end when it ends, walk in steps of 1 (which is the default, so you don't even need to write it). [::-1] means: Start at the end (the minus does that for you), end when nothing's left and walk backwards by 1.
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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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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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BetaYou can slice a string like so: stringname[x:y:z]. This will refer to a subsection of the string, stringname. x refers to the starting position, y to the end position (remember in python, x is inclusive and y is exclusive), and z is the jump between each item.
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