Python del, why?

Question

fx=[4, 5, 6, 7, 8, 10, 12, 15, 20, 25]
del fx[::6]
print(fx)
# why the answer is [5,6,7,8,10,15,20,25]

Answer 1

Let's see what you are telling your program to do:-

fx=[4, 5, 6, 7, 8, 10, 12, 15, 20, 25]
#here you told it to make a list as follows

del fx[::6]
'''now you want it to delete items STARTING from 0 index and the skip 6 values and then delete one item and so on
So the program will delete values at index 0 and 6 that are values 4 and 12'''

print(fx)
#print the resultant list

So the answer is [5,6,7,8,10,15,20,25]

Answer 2

Wonderful, make sense, thank you Arsenic!