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Add the current item with the previous item in a list using python

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by vsasikalabe dot icon Updated: Feb 22, 2023

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Python's append() function adds a single element to a previous element in a list. Without returning to a new list, the element will be added to the end of the old list. A single element is added to the end of a list as an argument. We can find the cumulative sum of values when adding values in sequence to the previous value with a constant and adding the constant to the Output. 


In Python, the below four methods are used to add elements to a List.

  • List Concatenation: To concatenate multiple lists, we can use the + operator and create a new list. 
  • append(): add the element to the end of the list and the current element to the previous element.
  • insert(): inserts the element before the given index.
  • extend(): extends the list by adding the elements.

We can add elements to the list using the built-in append() function. Using the append() method, only one element can be added to the list. Loops are used to add multiple elements with the append() method. The tuples are immutable, so using the append methods, tuples can also be added to the list. Unlike Sets, we can also add lists to the existing list using the append() method.

We can hold different data types and Python objects using Lists so you can use .append() to add objects to a given list. Sometimes, you add an integer number, a string, and a floating-point number. We can add another list, a tuple, a dictionary, a user-defined object, etc. Sometimes for a list, += is more like the extend method than the append method. With a list to the left of the += operator, another list is needed to the operator's right. Every item in the list to the operator's right gets added to the end of the list. The left of the operator can do this.


Here is an example of how to add the current item with the previous item in a list using Python:

Fig : Preview of the output that you will get on running this code from your IDE.

Code

PythondotLines of Code : 12dotLicense : Strong Copyleft (CC BY-SA 4.0)

Dependent Libraries : 
a = [4, 2, 1, 3]
b = []
for i in range(len(a)):
    if i == 0:
        b.append(a[i])
    else:
        b.append(a[i] + a[i-1])

print(b)

[4, 6, 3, 4]

Instructions

Follow the steps carefully to get the output easily.

  1. Download and install Pycharm on your computer.
  2. Copy the snippet using the 'copy' and paste it into your IDE.
  3. Run the file to generate the output.


I hope you found this useful.


I found this code snippet by searching for ' Add the current item with the previous item in a list using python'in kandi. You can try any such use case!

Environment Tested

I tested this solution in the following versions. Be mindful of changes when working with other versions.

  1. The solution is created in PyCharm 2021.3.
  2. The solution is tested on Python 3.9.7.


Using this solution, we are able to add the current item with the previous item in a list using python with simple steps. This process also facilities an easy way to use, hassle-free method to create a hands-on working version of code which would help us to add the current item with the previous item in a list using python.

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