Python loop counter in a for loop

Question

In my example code below, is the counter = 0 really required, or is there a better, more Python, way to get access to a loop counter? I saw a few PEPs related to loop counters, but they were either deferred or rejected (PEP 212 and PEP 281).

This is a simplified example of my problem. In my real application this is done with graphics and the whole menu has to be repainted each frame. But this demonstrates it in a simple text way that is easy to reproduce.

Maybe I should also add that I'm using Python 2.5, although I'm still interested if there is a way specific to 2.6 or higher.

# Draw all the options, but highlight the selected index
def draw_menu(options, selected_index):
    counter = 0
    for option in options:
        if counter == selected_index:
            print " [*] %s" % option
        else:
            print " [ ] %s" % option
        counter += 1


options = ['Option 0', 'Option 1', 'Option 2', 'Option 3']

draw_menu(option, 2) # Draw menu with "Option2" selected

When run, it outputs:

 [ ] Option 0
 [ ] Option 1
 [*] Option 2
 [ ] Option 3

Answer 1

Use enumerate() like so:

def draw_menu(options, selected_index):
    for counter, option in enumerate(options):
        if counter == selected_index:
            print " [*] %s" % option
        else:
            print " [ ] %s" % option    

options = ['Option 0', 'Option 1', 'Option 2', 'Option 3']
draw_menu(options, 2)

Note: You can optionally put parenthesis around counter, option, like (counter, option), if you want, but they're extraneous and not normally included.