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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 (6 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 (6 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.)