List vs index:

[Frederico_Caldas]

Hello all,

i'm trying to understand what should i change on my code so that i can use any words / sentence on the string:

Given a string, display only those characters which are present at an even index number.

1. My code:

Str='pynative'
a=list(Str)
print(a)
for letter in a:
    index=a.index(letter)
    if index % 2==0:
        print('index=',index,'letter=', letter)

2. The result:

Output:
['p', 'y', 'n', 'a', 't', 'i', 'v', 'e']
index= 0 letter= p
index= 2 letter= n
index= 4 letter= t
index= 6 letter= v

3. What to do to use any word and get the correct index position?

result above is ok but not suitable for example if i have a string='Hello World'.
the code does not recognize that each l occupies a different index position.

thanks in advance
frederico