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Output: In this tutorial, you’ll learn how to use Python to get all combinations of a list. In particular, you’ll learn how to how to use the The Quick Answer: Use itertools.combinations to Get All Combinations of a List
What Does it Mean to Get All Combinations of a List?In your Python journey, you may encounter the need to get all combinations of the items in a list. But what does this mean? Let’s say you have a list that looks like this: When you create a list of all possible combinations, you’ll end up with a list that looks like this: Now that you know what it means to get a list of all possible combinations of a list in Python, let’s see how you can get this done in Python! Python comes built-in with a helpful library called Let’s take a
look at how the itertools.combinations(iterable, r)
Now that you know how the from itertools import combinations sample_list = ['a', 'b', 'c'] list_combinations = list() for n in range(len(sample_list) + 1): list_combinations += list(combinations(sample_list, n)) print(list_combinations) # Returns: [(), ('a',), ('b',), ('c',), ('a', 'b'), ('a', 'c'), ('b', 'c'), ('a', 'b', 'c')] Let’s break down what we’ve done here:
We can see that our list includes a blank combination as well.
If we wanted to omit this, we could change our for-loop to be from In the next section, you’ll learn how to get all combinations of only unique values in a list. Want to learn more about Python for-loops? Check out my in-depth tutorial here to learn all you need to know! How to Get All Combinations of Unique Values of a List in PythonIn this section, you’ll learn how to get all combinations of only unique values of a list in Python. Since Python lists can contain duplicate values, we’ll need to figure out how to do this. Say we have a list that looks like this: Let’s see how we can do this in Python: from itertools import combinations sample_list = ['a', 'b', 'c', 'c'] list_combinations = list() sample_set = set(sample_list) for n in range(len(sample_set) + 1): list_combinations += list(combinations(sample_set, n)) print(list_combinations) This follows the same logic as the example above. The only difference is that we have first created a set out of our list. Sets are a unique data structure in Python that require each item to be unique. Therefore, it’s a helpful way to de-duplicate our list. We then iterate over the length of the set and the set itself, to create all possible combinations. How to Get All Combinations with Replacement of a List in PythonIn this final section, you’ll learn how to get all combinations of a list in Python with replacements. Meaning, that a single element has the potential for being picked again. Let’s see how this
can be done in Python, using from itertools import combinations_with_replacement sample_list = ['a', 'b', 'c'] list_combinations = list() for n in range(len(sample_list) + 1): list_combinations += list(combinations_with_replacement(sample_list, n)) print(list_combinations) # Returns: [(), ('a',), ('b',), ('c',), ('a', 'a'), ('a', 'b'), ('a', 'c'), ('b', 'b'), ('b', 'c'), ('c', 'c'), ('a', 'a', 'a'), ('a', 'a', 'b'), ('a', 'a', 'c'), ('a', 'b', 'b'), ('a', 'b', 'c'), ('a', 'c', 'c'), ('b', 'b', 'b'), ('b', 'b', 'c'), ('b', 'c', 'c'), ('c', 'c', 'c')] We can see here that each item has the potential for being included once, twice, or three times in a list of three items. ConclusionIn this post, you learned how to get all combinations of a list in Python. You learned how to do this
with the To learn more about the How do you get all the combinations in Python?Combinations of a List in Python. Use the itertools.combinations() Function to Find the Combinations of a List in Python.. Use the itertools.combinations_with_replacement() Function to Find the Combinations of a List in Python.. Create a User-Defined powerset() Function to Find the Combinations of a List in Python.. How do you generate all possible combinations of one list?To list all combinations possible in an Excel sheet, follow the following procedure;. Step 1: Open the sheet. You first need to open the sheet with data from which you want to make all possible combinations. ... . Step 2: Select cell for result. ... . Step 3: Drag the formula to other cells.. How do you get all the combinations of two lists in Python?How to get all unique combinations of two lists in Python. list1 = ["a", "b", "c"]. list2 = [1, 2]. all_combinations = []. list1_permutations = itertools. permutations(list1, len(list2)) ... . for each_permutation in list1_permutations:. zipped = zip(each_permutation, list2). all_combinations. ... . print(all_combinations). How do you generate all possible combinations of two lists?Add a Custom Column to and name it List1. Enter the formula =List1. Expand out the new List1 column and then Close & Load the query to a table. The table will have all the combinations of items from both lists and we saved on making a custom column in List1 and avoided using a merge query altogether!
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