I cannot delete and the elements from the list

[quest]

Python documentation, The return statement:

return may only occur syntactically nested in a function definition, not within a nested class definition.

Function is nowhere to be seen.

I just did not paste the beginning of the function but it is not a problem. THe problem is that I cannot delete my elements from the list. I tried a small program for seeing what is going on here and the result is same:

l2=[0,1,2,3,4,5,6,7,8,9]
a=1
l2.copy()
for ind,el in enumerate(l2):   
    if a==el:
       l2.remove(ind)
    else:
       #l2.pop(ind)
       l2.remove(ind)
print(l2)     

it should return an empty list but no !