Python - Default Counter Variable in For loop

Question

Is there any default Counter Variable in For loop?

Answer 1

No, you give it a name: for i in range(10): ...

If you want to iterate over elements of a collection in such a way that you get both the element and its index, the Pythonic way to do it is for i,v in enumerate(l): print i,v (where l is a list or any other object implementing the sequence protocol.)

Answer 2

Generally, if you are looping through a list (or any iterator) and want the index as well, you use enumerate:

for i, val in enumerate(l):
   <do something>