The For each index Deluge List syntax executes a set of tasks repeatedly, for each element in the list and provides index starting from 0 as instance variable.
for each index <variable> in <list>
<variable> is instance variable name which iterates each index starting from 0.
<list> the list name
In the following sample code, index_val is the user-defined instance variable name which will hold the value of the index, starting from 0, in the sports_list.
for each index_val in sports_list