WebHow to access multiple elements of list knowing their index in Python? WebMay 24, 2024 · Note that this is around 100 times faster than looping and checking a modulus for each element: $ python -m timeit -s "lst = list (range (1000))" "lst1 = [x for x in lst if x % 10 == 0]" 1000 loops, best of 3: 525 usec per loop $ python -m timeit -s "lst = list (range (1000))" "lst1 = lst [0::10]" 100000 loops, best of 3: 4.02 usec per loop Share
Find indexes of common items in two python lists
WebMar 31, 2024 · Initialize an empty list called “res_list” to store the indices of the target values. Iterate through each element in the input list “test_list” using a for loop. If the current element matches the target value, append its index to the “res_list”. After the loop is finished, return the “res_list” as the output. Python3. WebJul 4, 2024 · You can efficiently find the common elements in the two lists by using python set as follows both = set (list_A).intersection (list_B) Then you can find the indices using the build-in index method indices_A = [list_A.index (x) for x in both] indices_B = [list_B.index (x) for x in both] Share Improve this answer Follow edited May 6, 2024 at 8:40 smart disk health
Python Index – How to Find the Index of an Element in a List
WebOct 2, 2013 · def select (lst, indices): return (lst [i] for i in indices) And then you could call the function with: select (L, [2, 5]) or any list of your choice. Update: I now recommend using operator.itemgetter instead unless you really need the lazy evaluation feature of generators. See John Y's answer. Share Improve this answer Follow WebJan 25, 2024 · Data Structures & Algorithms in Python; Explore More Self-Paced Courses; Programming Languages. C++ Programming - Beginner to Advanced; Java Programming - Beginner to Advanced; C Programming - Beginner to Advanced; Web Development. Full Stack Development with React & Node JS(Live) Java Backend Development(Live) … WebDec 15, 2013 · Specifically, I need to access these elements in order to use them to look up a value in a matrix A. list = [1,2,3,4,5] for i in list: value = A [i,i+1] #access A [1,2], A [2,3], A [3,4], A [4,5] the problem with this is that I can't do an i+1 operation to access the n+1 element of my list. This is my first time programming in Python and I ... smart disk monitor windows 10