This question already has answers here:
Python allows multiplication of lists:
my_list = [0,1,2,3,4,5,6,7,8,9]
n = 2
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
Repeating elements of a list n times, In case you really want result as list, and generator is not sufficient: import itertools lst = range(1,5) list(itertools.chain.from_iterable(itertools.repeat(x, 3) for x in 2. How to Create a Repeat List with itertools? Python module itertools has a function called repeat, which can be used to get a list repeating single element n times. If we want to create a list repeating number 5, ten times we can use itertools.repeat function as follows. import itertools itertools.repeat(5, 10) itertools.repeat function yields an iterator not a list. So to get a list we can convert the iterator using list function.
If the generated list is large, it can be better to use a generator, so that items are generated one at a time on the fly without creating the whole large list in memory:
from itertools import islice, cycle
def repeat(lst, times):
return islice(cycle(lst), len(lst)*times)
lst = [0, 1, 2, 3, 4, 5]
for item in repeat(lst, 3):
print(item, end=' ')
#0 1 2 3 4 5 0 1 2 3 4 5 0 1 2 3 4 5
You can still create a list if you want:
# [0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5]
How it works:
itertools.cycle will cycle on
lst indefinitely, and we keep only the
len(lst) * times first items using
itertools.islice 3 Ways To Create a List Repeating an Item, Here are three ways one can create a list with a single element repeated 'n' times. 1. How to Create a Repeat List with List Comprehension? One Python | Repeating tuples N times Sometimes, while working with data, we might have a problem in which we need to replicate, i.e construct duplicates of tuples. This is important application in many domains of computer programming.
Just use multiplication
[1,2,3] * 3
Python, Python | Add similar value multiple times in list · Python | Remove elements of list that are repeated less than k times · Python | Check if k occurs atleast n times in a def repeat(a,n): print((((a*n)+'\n')*n)[:-1]) Let's split this up. a*n repeats string n times, which is what you want in one line +'\n' adds a new line to the string so that you can go to the next line *n because you need to repeat it n times; the [:-1] is to remove the last as print puts a new-line by default.
This is how you can achieve it.
arr2=arr1*n #number of times you want to repeat
Python, The multiplication operator can be used to construct the duplicates of a container. N = 4. # Repeating tuples N times. # using * operator. res = ((test_tup, ) * N) Python | Find the tuples containing the given element from a list of tuples numpy.repeat (arr, repetitions, axis = None) : repeat elements of the array – arr. Create List of Single Item Repeated n Times in Python, To create a list of Single Item Repeated n Times in Python, you can use the following piece of code:- >>>[e] * n. An important note is if e is an empty list you get a If you want to repeat individual letters you can just replace the letter with n letters e.g. >>> s = 'abcde' >>> s.replace('b', 'b'*5, 1) 'abbbbbcde' share | improve this answer | follow | repeat - Numpy and Scipy, Note that this is not the “repeat n n times” built-in — its function is more Python 3, 14 bytes *]QQ - Full program with implicit input ] - Turn the input into a list. Python | Repeat each element K times in list filter_none edit close play_arrow link brightness_4 code. This particular problem can also be solved using python edit close. play_arrow. link brightness_4 code. This particular problem can also be solved using python inbuilt functions of itertools
Turn an integer n into a list containing it n times, Done n times, this becomes an O(n²) operation. numbers in challenge & 0-based lists in python, you'll want to use a count array of n+1 zeros. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Learn more Creating a list in Python with multiple copies of a given object in a single line