Sometimes, when working with Python lists of lists, you’ll encounter sublists that are of different lengths.
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Want to dive a little deeper into the zip() function in Python? Check out this in-depth tutorial that covers off how to zip two lists together in Python, with easy to follow examples! Use Itertools to Transpose a Python List of Lists In the next section, you’ll learn how to use the itertools library to be able to turn lists of lists of different lengths into their transposed versions. By default, the zip objects will return tuples, which may not always be ideal. Finally, we used a list comprehension to turn each item of the list into a list.
We created a list object using the list() function, out of zipping all the items in the list_of_lists object. Let’s take a look at what we’ve done here: Transposed_tuples = list(zip(*list_of_lists)) 
So let’s take a look at how we can do transpose a list of lists using the zip() function: # Transpose a list of lists in Python using numpy Now, this might sound a tad confusing, and it can be easier to see it in action than to understand it in theory, right off the bat. The zip() function is an incredibly helpful method that allows us to access the n th item of an iterable in sequence, as we loop over multiple iterable objects. Let’s now take a look at how we can use the built-in zip() function to transpose a list of lists in Python. Use the Zip Function to Transpose a List of Lists in Python Want to learn how to transpose a Pandas Dataframe? Check out my in-depth tutorial with easy to follow along examples here. In the next section, you’ll learn how to transpose a two-dimensional array using the built-in zip() function. tolist() method to turn our array back to a list of lists
Convert our list of lists to a numpy array. # This is the same as: transposed = np.array(list_of_lists).T.tolist()įrom the example above, we can see how easy it is to use numpy to transpose a Python list of lists. Transposed_list_of_lists = transposed_array.tolist() Let’s see how we can use numpy to transpose a list of lists: # Transpose a list of lists in Python using numpy T.īefore we can use any of these methods, however, we need to convert our list or our list of lists to a numpy array. transpose() method, which can also be shortened to just. One of these operations is the transposing of data, using either the. These arrays share many qualities with Python lists but also allow us to complete a number of helpful mathematical operations on them. Python comes with a great utility, numpy, that makes working with numerical operations incredibly simple! Numpy comes packaged with different object types, one of which is the numpy array. Transpose a Python List of Lists using Numpy Now let’s get started at learning how to transpose a two-dimensional array in Python. Let’s take a look at what this looks like visually: original = [ When we transpose a list of lists, we essentially turn the rows of our matrix into the columns, and turn the columns into the rows. We can think of sublists in our list of lists in Python as the rows of a matrix. But what exactly does it mean to transpose a list of lists in Python? Transposing arrays is a common function you need to do when you’re working on machine learning projects. What Does it Mean to Transpose a Python List of Lists? Use a List Comprehension to Transpose a List of Lists in Python. Transpose a Python List of Lists using a For Loop. Use Itertools to Transpose a Python List of Lists. Use the Zip Function to Transpose a List of Lists in Python. Transpose a Python List of Lists using Numpy. What Does it Mean to Transpose a Python List of Lists?.
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