Welcome to Software Development on Codidact!
Will you help us build our independent community of developers helping developers? We're small and trying to grow. We welcome questions about all aspects of software development, from design to code to QA and more. Got questions? Got answers? Got code you'd like someone to review? Please join us.
Post History
The library module itertools provides a function called dropwhile(). The example they give is: dropwhile(lambda x: x<5, [1,4,6,3,8]) → 6 3 8 So, to get a list of numbers greater than 4, d...
Answer
#2: Post edited
by
aghast
·
2024-05-31T14:32:00Z (7 months ago)
Add hint about drop while
- The library module [`itertools`](https://docs.python.org/3/library/itertools.html) provides a function called `dropwhile()`.
- The example they give is:
- dropwhile(lambda x: x<5, [1,4,6,3,8])
- → 6 3 8
So, to get a list of numbers greater than 4:- import itertools
- l = [1, 3, 5, 6, 7, 8]
- result = itertools.dropwhile(lambda x: x<=4, l)
- Note that `result` at this point will be a lazy iterator object of some kind, not an actual list. So you might have to do: `print(*result)` to confirm it works. But you can iterate it, or call `list(result)` to make it a true list. (Remember, also, that iterators get consumed.)
- The library module [`itertools`](https://docs.python.org/3/library/itertools.html) provides a function called `dropwhile()`.
- The example they give is:
- dropwhile(lambda x: x<5, [1,4,6,3,8])
- → 6 3 8
- So, to get a list of numbers greater than 4, drop items while they are less than or equal to 4:
- import itertools
- l = [1, 3, 5, 6, 7, 8]
- result = itertools.dropwhile(lambda x: x<=4, l)
- Note that `result` at this point will be a lazy iterator object of some kind, not an actual list. So you might have to do: `print(*result)` to confirm it works. But you can iterate it, or call `list(result)` to make it a true list. (Remember, also, that iterators get consumed.)
#1: Initial revision
by
aghast
·
2024-05-31T14:30:29Z (7 months ago)
The library module [`itertools`](https://docs.python.org/3/library/itertools.html) provides a function called `dropwhile()`.
The example they give is:
dropwhile(lambda x: x<5, [1,4,6,3,8])
→ 6 3 8
So, to get a list of numbers greater than 4:
import itertools
l = [1, 3, 5, 6, 7, 8]
result = itertools.dropwhile(lambda x: x<=4, l)
Note that `result` at this point will be a lazy iterator object of some kind, not an actual list. So you might have to do: `print(*result)` to confirm it works. But you can iterate it, or call `list(result)` to make it a true list. (Remember, also, that iterators get consumed.)