Skip to content
Related Articles

Related Articles

Python – Itertools.chain.from_iterable()
  • Last Updated : 09 Mar, 2020

Python’s Itertool 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.

Note: For more information, refer to Python Itertools

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

Chain.from_iterable() method

The function chain.from_iterable() 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)

Example #1:



filter_none

edit
close

play_arrow

link
brightness_4
code

# 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))

chevron_right


Output :

[‘g’, ‘e’, ‘e’, ‘k’, ‘s’, ‘f’, ‘o’, ‘r’, ‘g’, ‘e’, ‘e’, ‘k’, ‘s’]

Example #2:

filter_none

edit
close

play_arrow

link
brightness_4
code

# 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))

chevron_right


Output :

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

Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.

To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course.

My Personal Notes arrow_drop_up
Recommended Articles
Page :