View Discussion
Improve Article
Save Article
View Discussion
Improve Article
Save Article
Often, when dealing with iterators, we also get 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:
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
Example
Python3
l1 = ["eat", "sleep", "repeat"]
s1 = "geek"
obj1 = enumerate(l1)
obj2 = enumerate(s1)
print ("Return type:", type(obj1))
print (list(enumerate(l1)))
print (list(enumerate(s1, 2)))
Output:
Return type: [(0, 'eat'), (1, 'sleep'), (2, 'repeat')] [(2, 'g'), (3, 'e'), (4, 'e'), (5, 'k')]Using Enumerate object in loops:
Python3
l1 = ["eat", "sleep", "repeat"]
for ele in enumerate(l1):
print (ele)
for count, ele in enumerate(l1, 100):
print (count, ele)
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 repeatThis 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 . 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.
In this tutorial, we will learn about the Python enumerate() method with the help of examples.
The enumerate() method adds a counter to an iterable and returns it (the enumerate object).
Example
languages = ['Python', 'Java', 'JavaScript']enumerate_prime = enumerate(languages)
# convert enumerate object to list print(list(enumerate_prime)) # Output: [(0, 'Python'), (1, 'Java'), (2, 'JavaScript')]Syntax of enumerate()
The syntax of enumerate() is:
enumerate(iterable, start=0)enumerate() Parameters
enumerate() method takes two parameters:
- iterable - a sequence, an iterator, or objects that supports iteration
- start (optional) - enumerate() starts counting from this number. If start is omitted, 0 is taken as start.
enumerate() Return Value
enumerate() method adds counter to an iterable and returns it. The returned object is an enumerate object.
You can convert enumerate objects to list and tuple using list() and tuple() method respectively.
Example 1: How enumerate() works in Python?
grocery = ['bread', 'milk', 'butter']enumerateGrocery = enumerate(grocery)
print(type(enumerateGrocery)) # converting to list print(list(enumerateGrocery)) # changing the default counterenumerateGrocery = enumerate(grocery, 10)
print(list(enumerateGrocery))Output
<class 'enumerate'> [(0, 'bread'), (1, 'milk'), (2, 'butter')] [(10, 'bread'), (11, 'milk'), (12, 'butter')]Example 2: Looping Over an Enumerate object
grocery = ['bread', 'milk', 'butter']for item in enumerate(grocery): print(item)
print('\n')for count, item in enumerate(grocery): print(count, item)
print('\n') # changing default start value for count, item in enumerate(grocery, 100): print(count, item)Output
(0, 'bread') (1, 'milk') (2, 'butter') 0 bread 1 milk 2 butter 100 bread 101 milk 102 butter