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Python itertools.batched() Function

The Python itertools.batched() function is used to create an iterator that returns batches of a specified size from an iterable. This function is useful for processing data in fixed-size chunks.

If the number of elements in the iterable is not a multiple of the batch size, the final batch will contain the remaining elements.

Following is the syntax of the Python itertools.batched() function −

itertools.batched(iterable, n)

This function accepts the following parameters −

• iterable: The input sequence that needs to be batched.
• n: The size of each batch.

This function returns an iterator that yields tuples containing batches of elements from the given iterable.

Following is an example of the Python itertools.batched() function. Here, we divide a list into batches of size 2 −

import itertools

numbers = [1, 2, 3, 4, 5, 6]
batches = itertools.batched(numbers, 2)
for batch in batches:
   print(batch)

Following is the output of the above code −

(1, 2)
(3, 4)
(5, 6)

Here, we batch a list of strings into groups of 3 elements each using the itertools.batched() function −

import itertools

words = ["apple", "banana", "cherry", "date", "elderberry", "fig", "grape"]
batches = itertools.batched(words, 3)
for batch in batches:
   print(batch)

Output of the above code is as follows −

('apple', 'banana', 'cherry')
('date', 'elderberry', 'fig')
('grape',)

Now, we use itertools.batched() function to process a range of numbers in groups of 4 −

import itertools

numbers = range(1, 11)
batches = itertools.batched(numbers, 4)
for batch in batches:
   print(batch)

The result obtained is as shown below −

(1, 2, 3, 4)
(5, 6, 7, 8)
(9, 10)

The itertools.batched() function can also be used to process data in batches while working with files.

Here, we read a list of lines and process them in batches of 2 −

import itertools

lines = ["line1", "line2", "line3", "line4", "line5"]
batches = itertools.batched(lines, 2)
for batch in batches:
   print(batch)

The result produced is as follows −

('line1', 'line2')
('line3', 'line4')
('line5',)

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