.remove() in list !

Question

Why does it removes only the odds? What are the steps!?

a=[0 ,1 , 2, 3, 4, 5, 6, 7, 8, 9, 10]
for i in a:
print(i)
a.remove(i)

Output is:

0
2
4
6
8
10

Answer 1

This would work fine as it deletes from the end to the beginning.
a=[0 ,1 , 2, 3, 4, 5, 6, 7, 8, 9, 10]
for i in reversed(a):
print(i)
a.remove(i)

Answer 2

Once you remove, everything shifts their position. That screws up the indexing. Always reverse index, when removing, as the shifting stuff has already been processed.

Answer 3

1: a=[0 ,1 , 2, 3, 4, 5, 6, 7, 8, 9, 10]
2: for i in a:
3: print(i)
4: a.remove(i)
When line 2 executes, i is 0 so line 4 removes it. Now, a is [1 , 2, 3, 4, 5, 6, 7, 8, 9, 10]. Line 2 now grabs the second number 2 and it gets removed.

Answer 4

Sorry John This time it’s not clear to me yet :-(

Answer 5

Try it this way my friend, the problem is that size of the list decreased every time you call remove function but using list function again it makes a copy then you can manipulate the list as you like.

a=[0 ,1 , 2, 3, 4, 5, 6, 7, 8, 9, 10]
for i in list(a):
print(i)
a.remove(i)