Mar 1, 2014 · A list comprehension is usually a tiny bit faster than the precisely equivalent for loop (that actually builds a list), most likely because it doesn't have to look up the list and its append method on every iteration. However, a list comprehension still does a bytecode-level loop:

Feb 18, 2015 · First function uses a list comprehension. return sum(dgt1 != dgt2 for dgt1, dgt2 in zip(s1, s2)) Second function uses a classic for loop. tot = 0. for d1, d2 in zip(s1, s2): if d1 != d2: tot += 1. return tot. The complexity of the second code is clearly O(N) where len(s1)=len(s2)=N.

Aug 3, 2012 · List comprehension is more than twice as fast as explicit loop. Base on Ben James' variation, but replace the x**2 with a more trivial x+2 function, the two alternatives are: def foo(n): L = [] for x in xrange(n): L.append(x+2) return L def bar(n): return [x+2 for x in xrange(n)]

Sep 17, 2020 · Many simple "for loops" in Python can be replaced with list comprehensions. You can often hear that list comprehension is "more Pythonic" (almost as if there was a scale for comparing how Pythonic something is 😉). In this article, I will compare their performance and discuss when a list comprehension is a good idea, and when it's not.

Apr 13, 2023 · List comprehensions are generally faster than for loops for creating lists because they do not require the overhead of the loop construct. They are also more concise and easier to read than...

Nov 15, 2021 · LIST_APPEND is the crucial difference between for loop and comprehensions implementations: the latter does not load the collection (be it list, dict, or set) for each iteration, it is always on the stack, plus it is always ready to add it to the collection.

Sep 25, 2024 · As demonstrated, list comprehension is faster because of Python’s internal optimizations. But what makes it faster than a for loop? In a for loop, each iteration requires the interpreter to...

Apr 10, 2024 · Two popular methods for iteration are list comprehension and for loops. While both serve similar purposes, they have distinct syntaxes, strengths, and weaknesses. In this article, we'll explore the differences between list comprehension and for loops in …

Aug 4, 2021 · List comprehensions and comprehensions in general are actually more efficient than their For Loop counterparts. Once you get the hang of it they are actually easier to read. They are commonly used.

Aug 2, 2020 · python is written in C under the hood so the list comp version does a better job at moving the computation to the C level, rather than the slower python level of computation. here are the instructions for a loop and list comp alternative: ...: x = [] ...: for _ in range(10): ...: x.append(1) ...: return x.