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The outcome present that In case the iterable incorporates only some inner iterables then sum will probably be swiftest, however for extended iterables just the itertools.
Shawn ChinShawn Chin 87.2k2020 gold badges168168 silver badges193193 bronze badges 5 28 The * may be the tricky detail that makes chain less simple compared to list comprehension. You should realize that chain only joins together the iterables handed as parameters, along with the * will cause the highest-stage list to get expanded into parameters, so chain joins together all All those iterables, but would not descend more. I do think this makes the comprehension a lot more readable than the usage of chain In this instance.
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The colon, :, is what tells Python you happen to be giving it a slice rather than a daily index. That's why the idiomatic way of creating a shallow copy of lists in Python two is
Backing up a bit, what transpires after you maintain going with our procession of counting up the slice beginning?
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It is comparable to how defining variable x as x = 10 if Legitimate is actually a SyntaxError. Therefore if expression features a conditional assertion, it must have else in it, much like x = 10 if Genuine else five is Okay to determine variable x.
AlexanderAlexander 110k3232 gold badges212212 silver badges208208 bronze badges one There is no magic: i is a component of your list returned by range (or sequence in python three). Oh, BTW: they're all lists, not arrays.
62 @RobCrowell Similar below. To me the list comprehension a single would not study suitable, a thing feels off about it - I usually appear to get it Incorrect and turn out googling.
With slicing, after you're finished, you're carried out; it isn't going to begin slicing backwards. In Python you don't get adverse strides Until you explicitly request them through the use of a negative quantity.
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