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?

You might also be interested in the answers to iterating over a list in chunks: stackoverflow.com/questions/434287/… — Dave Bacher
– Dave Bacher, Commented Jul 1, 2010 at 23:25

Mateen Ulhaq · Accepted Answer · 2022-05-08 17:52:09Z

806

The pythonic way is to use enumerate:

for idx, item in enumerate(my_list):

edited May 8, 2022 at 17:52

Mateen Ulhaq

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answered Jul 1, 2010 at 23:02

Nick Bastin

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2 Comments

prashant thakre Over a year ago

Super duper , Just one magic line solving all problems

Online User Over a year ago

Phenomenal answer, I always come back to copy this line

Vikram Garg · Accepted Answer · 2017-10-07 12:21:29Z

127

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.

edited Oct 7, 2017 at 12:21

answered Oct 16, 2013 at 8:34

Vikram Garg

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1 Comment

Stefan Pochmann Over a year ago

You could also use enumerate's optional start parameter to start enumerating with 1 instead of 0, though then I'd use the OP's name count instead of idx.

Hans Ginzel · Accepted Answer · 2021-03-16 20:59:13Z

4

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 ...

1 Comment

fragadass Over a year ago

The PEP you mentioned was rejected in favor of the enumerate() function

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