`enumerate()` Function in Python [ English ]

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1. Introduction

The enumerate() function in Python is a built-in function used to add a counter to an iterable object such as a list, tuple, or string. It returns an enumerate object, which produces pairs containing the index and the corresponding element from the iterable.

The enumerate() function is very useful when we need to access both the index and value of elements while iterating through a sequence, especially in loops.

2. Syntax

enumerate(iterable, start=0)

Parameters

1. iterable Any iterable object such as a list, tuple, string, or dictionary.

2. start (optional) The starting value of the counter. By default, the counter starts from 0.

Return Value

• Returns an enumerate object containing pairs of index and element.

3. Basic Example

fruits = ["apple", "banana", "mango"]

result = enumerate(fruits)

print(list(result))

Output

[(0, 'apple'), (1, 'banana'), (2, 'mango')]

Explanation

• enumerate() assigns an index number to each element in the list.
• The result is a sequence of (index, value) pairs.

4. Using enumerate() in a Loop

fruits = ["apple", "banana", "mango"]

for index, value in enumerate(fruits):
    print(index, value)

Output

0 apple
1 banana
2 mango

Explanation

• The loop retrieves both the index and the element simultaneously.
• This makes iteration more convenient compared to manually tracking the index.

5. Example with Starting Index

names = ["Rahul", "Amit", "Priya"]

for i, name in enumerate(names, start=1):
    print(i, name)

Output

1 Rahul
2 Amit
3 Priya

Explanation

• The counter begins from 1 instead of 0 because the start parameter is set to 1.

6. Example with a String

text = "Python"

for index, char in enumerate(text):
    print(index, char)

Output

0 P
1 y
2 t
3 h
4 o
5 n

Explanation

• Each character of the string is assigned an index.

7. Example with a Tuple

numbers = (10, 20, 30)

for index, value in enumerate(numbers):
    print(index, value)

Output

0 10
1 20
2 30

8. Why enumerate() is Useful

Without enumerate():

fruits = ["apple", "banana", "mango"]

for i in range(len(fruits)):
    print(i, fruits[i])

With enumerate():

for i, fruit in enumerate(fruits):
    print(i, fruit)

Advantage

• Code becomes simpler, cleaner, and more readable.

9. Summary

• enumerate() is a built-in Python function.
• It adds a counter to iterable objects.
• It returns pairs of (index, element).
• The counter starts from 0 by default, but it can be changed using the start parameter.
• It is commonly used in loops to access both index and value simultaneously.