You will understand more when you see the full code together for this zip_longest() function. Above all and Most importantly, Call the Python zip_longest() function. How to fix the constraints that zip ignoring longer list? Then, we create a function called grouper. In this article, we will see how can use Python zip_longest() function with some examples. We have defined two lists which are a sequence of some numeric value. As you can see here both are of different lengths. Here, you use itertools.zip_longest() to yield five tuples with elements from letters, numbers, and longest. Fortunately this is easy to do using the zip() function. A tutorial of Python zip with two or more iterables. Python Research Centre. To process all of the inputs, even if the iterators produce different numbers of values, use zip_longest(). version_info [0] >= 3) PY3_2 = sys. from itertools import zip_longest #define list a and list b a = ['a', 'b', 'c', 'd'] b = [1, 2, 3] #zip the two lists together without truncating to length of shortest list list(zip_longest (a, b)) [('a', 1), ('b', 2), ('c', 3), ('d', None)] However, you can use the fillvalue argument to specify a different fill value to use: I think this answer in StackOverflow may help . from itertools import zip_longest l_1 = [1, 2, 3] l_2 = [1, 2] combinated = list(zip_longest(l_1, l_2, fillvalue="_")) print(combinated) There are a few things to note here. Definition Return an zip_longest object whose .__next__() method returns a tuple where the i-th element comes from the i-th iterable argument. Question or problem about Python programming: I have a list of arbitrary length, and I need to split it up into equal size chunks and operate on it. def zip_longest (* args, fillvalue = None): # zip_longest('ABCD', 'xy', fillvalue='-') --> Ax By C- D-iterators = [iter (it) for it in args] num_active = len (iterators) if not num_active: return while True: values = [] for i, it in enumerate (iterators): try: value = next (it) except StopIteration: num_active-= 1 if not num_active: return iterators [i] = repeat (fillvalue) value = fillvalue values. I am assuming that you all understand the list in python. We respect your privacy and take protecting it seriously. Your email address will not be published. Definition Return an zip_longest object whose .__next__() method returns a tuple where the i-th element comes from the i-th iterable argument. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. Python zip() The zip() function takes iterables (can be zero or more), aggregates them in a tuple, and return it. Let’s understand it with the above example. With this in mind, replace zip() in better_grouper() with zip_longest(): import itertools as it def grouper ( inputs , n , fillvalue = None ): iters = [ iter ( inputs )] * n return it . from itertools import zip_longest #define list a and list b a = ['a', 'b', 'c', 'd'] b = [1, 2, 3] #zip the two lists together without truncating to length of shortest list list(zip_longest (a, b)) [('a', 1), ('b', 2), ('c', 3), ('d', None)] However, you can use the fillvalue argument to specify a different fill value to use: Hi, Think that all of you seen a code where built-in zip function used. From the itertools documentation, it looks like maybe this is a difference between the python 2 and python 3 versions of itertools. zip_longest is a method that aggregates the elements from each of the iterables. Opens the accompanying sales_record.csv file from the GitHub link by using r mode inside a with block and first check that it is opened. By default, this function fills in a value of “None” for missing values: However, you can use the fillvalue argument to specify a different fill value to use: You can find the complete documentation for the zip_longest() function here. itertools.zip_longest() fills in the missing elements. Return a zip_longest object whose .__next__() method returns a tuple where the i-th element comes from the i-th iterable argument. Pythonic solution using zip_longest. Here, we will learn how to get infinite iterators & Combinatoric Iterators by Python Itertools. 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