Is there a way to get the run count of a for loop not using range?

Question

If I have a for loop using a range like this:

for x in range(10):

then in order to get the count, it's just x. But say I have a for loop using a list:

layer = [somedata,someotherdata...etc]
for row in layer:
     print #the number the loop is on

Is there a way to do this besides specifying an integer count variable and incrementing it each run through, like this?

layer = [somedata]
count = 0
for row in layer:
    print count
    count += 1

Answer 1

You can use enumerate. This will give you a count of every iteration and the value you're iterating.

Note: like range you can specify at what index to begin counting.

for count, row in enumerate(layer):
    print count

Answer 2

layer = ['a', 'b', 'c', 'd']
for index, value in enumerate(layer):
    print 'Index: {} Value: {}'.format(index,value)

Output

Index: 0 Value: a
Index: 1 Value: b
Index: 2 Value: c
Index: 3 Value: d