Split list into array python
In this tutorial, you’ll learn how to use Python to split a list, including how to split it in half and into n equal-sized chunks. You’ll learn how to split a Python list into chunks of Show
By the end of this tutorial, you’ll have learned:
The Quick Answer: Use List Indexing to Split a List in Python Use a for loop to split a Python list into chunks
How to Access a Python List by Its IndexOne of the many wonderful properties of lists is that they are ordered. This means that we can access an item, or a range of items, by its index. Let’s see how Python list indices work: We can see here that Python lists have both a positive index as well as a negative index. A positive index begins at position 0, meaning the first item. A negative list index begins at -1, allowing you to retrieve the last item of a list. Similarly, you can access ranges of data within a list using list slicing. This can be done by using the You can easily split a Python list in half using list indexing. As you learned above, you can select multiple items in a list using list slicing. Let’s see how we can use list slicing to split a list in half:
Let’s break down what we did in the code above:
In the following section, you’ll learn how to split a list into different sized chunks in Python. Split Lists into Chunks Using a For-LoopFor-loops in Python are an incredibly useful tool to use. They make a lot of Python methods easy to implement, as well as easy to understand. For this reason, let’s start off by using a for-loop to split our list into different chunks. One of the ways you can split a list is into n different chunks. Let’s see how we can accomplish this by using a for loop:
Let’s take a look at what we’ve done here:
We can see that this is a fairly straightforward way of breaking a Python list into chunks. Next, you’ll learn how to do accomplish this using Python list comprehensions. Split Python Lists into Chunks Using a List ComprehensionIn many cases, Python for-loops can be rewritten in a more Pythonic way by writing them as one-liners called list comprehensions. List comprehensions in Python have a number of useful benefits over for-loops, including not having to instantiate an empty list first, and not having to break your for-loop over multiple lines. Let’s see how we can write a Python list comprehension to break a list into chunks:
Before we break down this code, let’s see what the basic syntax of a Python list comprehension looks like: How List Comprehensions work in PythonNow let’s break down our code to see how it works:
While this approach is a little faster to type, whether or not it is more readable than a for-loop, is up for discussion. Let’s learn how to split our Python lists into chunks using numpy. Want to learn more? Check out my in-depth tutorial about Python list comprehensions by clicking here! Split Lists into Chunks Using NumPyNumpy is an amazing Python library that makes mathematical operations significantly easier. That being said, NumPy also works with a list-like object, called NumPy arrays, that make working with lists much easier. These NumPy arrays come packaged with lots of different methods to manipulate your arrays. It’s important to note that this method will only work with numeric values. In this section of the tutorial, we’ll use the NumPy Let’s see how we can use NumPy to split our list into 3 separate chunks:
This is a fairly long way of doing things, and we can definitely cut it down a little bit. Let’s see how that can be done:
Let’s break this down a little bit:
Want to learn more about division in Python? Check out my tutorial on how to use floored integer division and float division in Python in this tutorial here. Let’s
see how we can use Let’s see how we can do this:
We can see here that we can have a relatively simple implementation that returns a list of tuples. Notice one of the things that are done here is split the list into chunks of size n, rather than into n chunks. Frequently Asked QuestionsWhat is the best way to split a Python list? The best way to split a Python list is to use list indexing, as it gives you huge amounts of flexibility. When shouldn’t you use the NumPy array_split() Function to split a list in Python? The NumPy array_split() function allows you to easily split arrays into a given number of arrays. However, the function only works with numeric values (as NumPy arrays can only contain numeric values). ConclusionIn this post, you learned how to split a Python list into chunks. You learned how to accomplish splitting a Python list into chunks of Additional ResourcesTo learn more about related topics, check out the tutorials below:
Can I split a list in Python?To split the elements of a list in Python: Use a list comprehension to iterate over the list. On each iteration, call the split() method to split each string. Return the part of each string you want to keep.
How do you split items in a list in Python?The split() method of the string class is fairly straightforward. It splits the string, given a delimiter, and returns a list consisting of the elements split out from the string. By default, the delimiter is set to a whitespace - so if you omit the delimiter argument, your string will be split on each whitespace.
How do you split a list into two parts in Python?This can be done using the following steps:. Get the length of a list using len() function.. If the length of the parts is not given, then divide the length of list by 2 using floor operator to get the middle index of the list.. Slice the list into two halves using [:middle_index] and [middle_index:]. How do you split a list into delimiter in Python?Use split() method to split by delimiter. If the argument is omitted, it will be split by whitespace, such as spaces, newlines \n , and tabs \t . Consecutive whitespace is processed together. A list of the words is returned.
|