Get loop count inside a for-loop [duplicate]

Question

This for loop iterates over all elements in a list:

for item in my_list:
    print item

Is there a way to know within the loop how many times I've been looping so far? For instance, I want to take a list and after I've processed ten elements I want to do something with them.

The alternatives I thought about would be something like:

count=0
for item in my_list:
    print item
    count +=1
    if count % 10 == 0:
        print 'did ten'

Or:

for count in range(0,len(my_list)):
    print my_list[count]
    if count % 10 == 0:
        print 'did ten'

Is there a better way (just like the for item in my_list) to get the number of iterations so far?

Answer 1

The pythonic way is to use enumerate:

for idx, item in enumerate(my_list):

Answer 2

Agree with Nick. Here is more elaborated code.

#count=0
for idx, item in enumerate(list):
    print item
    #count +=1
    #if count % 10 == 0:
    if (idx+1) % 10 == 0:
        print 'did ten'

I have commented out the count variable in your code.

Answer 3

Using zip function we can get both element and index.

countries = ['Pakistan','India','China','Russia','USA']

for index, element in zip(range(0,countries),countries):

         print('Index : ',index)
         print(' Element : ', element,'\n')

output : Index : 0 Element : Pakistan ...

---

See also :

Python.org