I often change the parameters in the code to better understand. This output is unclear to me?

Question

https://code.sololearn.com/cZq8cy1nLP73/?ref=app

Answer 1

Range() with 1 parameter gives you a list of integers from 0 going up to but not including the parameter. Since -8 < 0, range(-8) doesn’t do anything. If you pass a second parameter to the range function, the first number replaces 0 as the start number, then it goes up to but not including the second parameter.

If you do range(-8, 0) you should see a different result.

Answer 2

The accumulate function goes something like this:
0 = 0
1 = 0 + 1
3 = 0 + 1 + 2
6 = 0 + 1 + 2 + 3
10 = 0 + 1 + 2 + 3 + 4
15 = 0 + 1 + 2 + 3 + 4 + 5
and so on...

while the takewhile function iterates through the list elements and gets that element if it satisfies the given expression in the function.