[Python] How to Use enumerate() Function

This article shows how to use enumerate() function.

What is enumerate function?

In the beginning, I explain briefly enumerate( ) function.

The enumerate() function is built-in function in Python.

So, We can use enumerate( ) function without "import".

By using the enumerate( ) function, the elements and indices of iterable objects (such as list, tuple, etc.) are got simultaneously.

The enumerate( ) function is often used with the "for loop".

Basic usage of enumerate function

I show basic usage of enumerate( ) function.

The enumerate( ) function takes iterables (such as list, tuple, etc.) as the arguments.

If you want the beginning of the index to be non-zero, specify the argument "start".

The argument "start" is optional.

Here is an example code.

fruits = ['Apple', 'Banana', 'Orange', 'Grape', 'Lemon']

fruits_enumerate = enumerate(fruits)

print(fruits_enumerate)
# <enumerate object at 0x0000023459307708>
print(list(fruits_enumerate))
# [(0, 'Apple'), (1, 'Banana'), (2, 'Orange'), (3, 'Grape'), (4, 'Lemon')]

> print(fruits_enumerate)
> # <enumerate object at 0x0000023459307708>

An enumerate object is generated.

> print(list(fruits_enumerate))

Since the elements cannot be checked as an enumerate object, they are converted to list type with the list( ) function.

The indices and elements are stored in the tuples.

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Use the enumerate( ) function with "for loop"

The enumerate( ) function is often used with "for loop".

Here is an example code.

fruits = ['Apple', 'Banana', 'Orange', 'Grape', 'Lemon']

for i, fruit in enumerate(fruits):
    print(i, fruit)
# 0 Apple
# 1 Banana
# 2 Orange
# 3 Grape
# 4 Lemon

By using the enumerate( ) function, the indices and elements are passed to the variable i and fruit.

Start index from 1 (non-zero)

If you want the beginning of the index to be non-zero, specify the argument "start".

Here is an example code.

fruits = ['Apple', 'Banana', 'Orange', 'Grape', 'Lemon']

for i, fruit in enumerate(fruits, start=1):
    print(i, fruit)
# 1 Apple
# 2 Banana
# 3 Orange
# 4 Grape
# 5 Lemon

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