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Python Python Collections (Retired) Slices Slicing With A Step

Posted by john larson
john larson
16,594 Points

@3:56 in the video Kenneth gets a descending list...I do not

# when Kenneth does this
# he gets a descending list from 7 to 2
# I get the number 6
my_list = list(range(20))
x = my_list[7-1]
print(x)

1 Answer

jacinator
jacinator
11,936 Points

Something is wrong with the video display or rendering I think. When you enter my_list[7-1] Python takes the math operand - and does 7 - 1. This means that what you are really doing is my_list[6] which will return 6.

Jason Anello
Jason Anello
Courses Plus Student 94,610 Points

Yeah, something might have went wrong with the video editing.

It probably should be showing

>>> my_list[7:1:-1]
[7, 6, 5, 4, 3, 2]
Clayton Dobbs
Clayton Dobbs
1,917 Points

Yeah, as soon as I saw that, I had to attempt as well. Like jacinator , I received 6 as well.