Python - Multiplying an array for - 1

Question

This empties array. Why?

i=[1,2,3,4]*(-1)
print(i)

Answer 1

When you multiply an integer n by a sequence python documentation says:

"Values of n less than 0 are treated as 0"

Hence you'll get an empty sequence of the same type. In your case an empty array.

Answer 2

My guess would be that there's a condition in the loop that looks like:

if multiplicator > 0:
....
else:
return []

[1]*2 -> [1, 1]
[1]*1 -> [1]
[1]*0 -> []
[1]*-1 -> ... still []