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Python - Itertools.chain.from_iterable() - GeeksforGeeks

Last Updated : 12 Jul, 2025

is a module that provides various functions that work on iterators to produce complex iterators. This module works as a fast, memory-efficient tool that is used either by themselves or in combination to form iterator algebra.

For more information, refer to

The functions under itertools can be classified into 3 categories

1. Functions producing Infinite Iterators
2. Functions producing Iterators terminating on the shortest input sequence
3. Functions producing Combinatoric generators

The function

comes under the category of terminating iterators. This function takes a single iterable as an argument and all the elements of the input iterable should also be iterable and it returns a flattened iterable containing all the elements of the input iterable.

Syntax :
chain.from_iterable(iterable)

# Importing chain class from itertools
from itertools import chain


# Single iterable containing iterable
# elements(strings) is passed as input
from_iterable = chain.from_iterable(['geeks',
                                     'for', 
                                     'geeks'])

# printing the flattened iterable
print(list(from_iterable))

['g', 'e', 'e', 'k', 's', 'f', 'o', 'r', 'g', 'e', 'e', 'k', 's']

# Importing chain class from itertools
from itertools import chain


# Single iterable containing iterable
# elements(strings and list) is passed
# as input
from_iterable = chain.from_iterable(['geeks', 
                                     'for',
                                     'geeks',
                                     ['w', 'i', 'n', 's']])

# printing the flattened iterable
print(list(from_iterable))

['g', 'e', 'e', 'k', 's', 'f', 'o', 'r', 'g', 'e', 'e', 'k', 's', 'w', 'i', 'n', 's']

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