I had already looked through this post: Python: building new list from existing by dropping every n-th element, but for some reason it does not work for me:
I tried this way:
def drop(mylist, n):
del mylist[0::n]
print(mylist)
This function takes a list and n
. Then it removes every n-th element by using n-step from list and prints result.
Here is my function call:
drop([1,2,3,4],2)
Wrong output: [2, 4]
instead of [1, 3]
Then I tried a variant from the link above:
def drop(mylist, n):
new_list = [item for index, item in enumerate(mylist) if index % n != 0]
print(new_list)
Again, function call:
drop([1,2,3,4],2)
Gives me the same wrong result:
[2, 4]
instead of [1, 3]
How to correctly remove/delete/drop every n-th item from a list?
Let's say you have the list:
a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
If you want to remove every k-th element you can do something like
del a[k-1::k]
For example with k = 3
, the current list is now
[1, 2, 4, 5, 7, 8, 10]
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