Question from the Operation Code Slack:
I have to create a function that sums of every 2 consecutives elements in a list. for example ([2,4,3,1,-2]). the output expected [6,7,4,-1]
So the basic idea here is to take the collection
| 2 |
| 4 |
| 3 |
| 1 |
| -2 |
and a copy of it that same collection that skips the first element (islice is a good fit for this)
from itertools import islice
return list(islice(lst, 1, None))| 4 | 3 | 1 | -2 |
You then zip the two together into a tuple.
return list(zip(lst, skipped))| 2 | 4 |
| 4 | 3 |
| 3 | 1 |
| 1 | -2 |
Now it is a simple matter of iterating each tuple and adding the two elements
return list(a+b for a,b in zipped)So putting it all together, it’s a one liner. Viola!
from itertools import islice
return list(a+b for a,b in zip(lst, islice(lst, 1, None)))| 6 | 7 | 4 | -1 |