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Enumerate() in Python

  • Difficulty Level : Easy
  • Last Updated : 08 Aug, 2021

Often, when dealing with iterators, we also get a need to keep a count of iterations. Python eases the programmers’ task by providing a built-in function enumerate() for this task. 
Enumerate() method adds a counter to an iterable and returns it in a form of enumerating object. This enumerated object can then be used directly for loops or converted into a list of tuples using the list() method.
 

Syntax: 

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enumerate(iterable, start=0)

Parameters:
Iterable: any object that supports iteration
Start: the index value from which the counter is 
              to be started, by default it is 0

 



Python3




#python
# Python program to illustrate
# enumerate function
l1 = ["eat","sleep","repeat"]
s1 = "geek"
 
# creating enumerate objects
obj1 = enumerate(l1)
obj2 = enumerate(s1)
 
print ("Return type:",type(obj1))
print (list(enumerate(l1)))
 
# changing start index to 2 from 0
print (list(enumerate(s1,2)))

Output: 

Return type: < type 'enumerate' >
[(0, 'eat'), (1, 'sleep'), (2, 'repeat')]
[(2, 'g'), (3, 'e'), (4, 'e'), (5, 'k')]

 

Using Enumerate object in loops:

Python3




# Python program to illustrate
# enumerate function in loops
l1 = ["eat","sleep","repeat"]
 
# printing the tuples in object directly
for ele in enumerate(l1):
    print (ele)
print
# changing index and printing separately
for count,ele in enumerate(l1,100):
    print (count,ele)
 
#getting desired output from tuple
for count,ele in enumerate(l1):
  print(count)
  print(ele)

Output: 

(0, 'eat')
(1, 'sleep')
(2, 'repeat')

100 eat
101 sleep
102 repeat

0
eat
1
sleep
2
repeat

This article is contributed by Harshit Agrawal. If you like GeeksforGeeks and would like to contribute, you can also write an article using write.geeksforgeeks.org or mail your article to review-team@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please write comments if you find anything incorrect, or have more information about the topic discussed above.
 




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