+- Python Forum (https://python-forum.io)
+-- Forum: Python Coding (https://python-forum.io/forum-7.html)
+--- Forum: General Coding Help (https://python-forum.io/forum-8.html)
+--- Thread: list loop and drop (/thread-24558.html)
list loop and drop - 3Pinter - Feb-19-2020
Hi,
I have a list and I loop it:
grab first item and do something with each item in the list
after that is done: no more need for first item.
grab second item and do something with each remaining item in the list
after that is done: no more need for second item.
etc
To visualize it:
[1,2,3,4,5]
1 will do something with 2,3,4,5 .... and drops 1
now the list is 2,3,4,5
2 will do something with 3,4,5 .... and drops 2
now the list is 3,4,5
itertool combinations makes a new list with all the unique combinations. Which kinda is what I'm doing HOWEVER given a list of thousands+ I THINK it's faster to yield the original list and somehow drop used item.
Makes sense? Curious how to do this.
RE: list loop and drop - michael1789 - Feb-19-2020
I imagine someone else can do it in one line, but here's what I thought up, and it works.
list_of_items = [1, 2, 3, 4, 5]
work_list = list_of_items.copy()
del work_list[0]
for item in list_of_items:
try:
print(sum(work_list))
del work_list[0]
except IndexError:
print("Done")