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Write a Python program to get the difference between the two list

Python: Difference between the two lists

Last update on October 08 2020 09:22:22 [UTC/GMT +8 hours]

Python | Difference between two lists

There are various ways in which the difference between two lists can be generated. In this article, we will see the two most important ways in which this can be done. One by using the set[] method, and another by not using it.

Examples:

Input : list1 = [10, 15, 20, 25, 30, 35, 40] list2 = [25, 40, 35] Output : [10, 20, 30, 15] Explanation: resultant list = list1 - list2

Note: When you have multiple same elements then this would not work. In that case, this code will simply remove the same elements.
In that case, you can maintain a count of each element in both lists.

Recommended: Please try your approach on {IDE} first, before moving on to the solution.

By the use of set[]:

In this method, we convert the lists into sets explicitly and then simply reduce one from the other using the subtract operator. For more reference on set visit Sets in Python.

Example:

Python3

# Python code t get difference of two lists

# Using set[]

def Diff[li1, li2]:

return list[set[li1] - set[li2]] + list[set[li2] - set[li1]]

# Driver Code

li1 = [10, 15, 20, 25, 30, 35, 40]

li2 = [25, 40, 35]

print[Diff[li1, li2]]

Output :

[10, 20, 30, 15]

Without using the set[]:

In this method, we use the basic combination technique to copy elements from both the list with a regular check if one is present in the other or not.

Example:

Python3

# Python code t get difference of two lists

# Not using set[]

def Diff[li1, li2]:

li_dif = [i for i in li1 + li2 if i not in li1 or i not in li2]

return li_dif

# Driver Code

li1 = [10, 15, 20, 25, 30, 35, 40]

li2 = [25, 40, 35]

li3 = Diff[li1, li2]

print[li3]

Output :

[10, 20, 30, 15]

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Get the Difference Between Two Lists in Python

Python Python List

Created: June-03, 2021 | Updated: July-09, 2021

There are many operations performed on data structures like lists, dictionaries, tuples, and arrays. In Python, these data structures are used in almost every program. One of these data structures is the lists in Python. Lists in Python programming helps in storing more than one item in just one variable. Finding out the difference between two lists is a very common task that almost every programmer carries out.

This tutorial will demonstrate several ways to get the difference between two lists in Python.

“difference between two lists python” Code Answer’s

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Pythonic Ways to Find the Difference Between Two Lists

Python Set seems to be the most obvious choice to identify the common as well as the difference of two lists. So, we are going to explore it first and then will use nested loops and list comprehension.

Before we move on to the solution part, let’s define the test parameters, i.e., the two lists which we have to find the difference.

# Test Input list_a = [11, 16, 21, 26, 31, 36, 41] list_b = [26, 41, 36]

And we want our solution to provide the following output:

# Expected Result # list_out = list_a - list_b list_out = [11, 21, 31, 16]

Let’s start to create a program to find the difference between two lists, first using sets.

Use set[] to find the difference of two lists

In this approach, we’ll first derive two SETs [say set1 and set2] from the LISTs [say list1 and list2] by passing them to set[] function. After that, we’ll perform the set difference operation. It will return those elements from list1 which don’t exist in the second.

Here is the sample Python program to get the difference of two lists.

""" Desc: Using set[] to find the difference between two lists in Python """ def list_diff[list1, list2]: return [list[set[list1] - set[list2]]] # Test Input list1 = [11, 16, 21, 26, 31, 36, 41] list2 = [26, 41, 36] # Run Test print[list_diff[list1, list2]]

After running this, you should see the following outcome:

[16, 11, 21, 31]

Without set[], using nested loops

In this method, we’ll use nested For Loop to compare each element of the first list with the second. And while traversing, we’ll be appending every non-matching item to a new [and empty] list.

The new list would finally include the difference between the two given sequences. Below is the sample program to demonstrate this approach.

""" Desc: Nested loop to find the difference between two lists in Python """ def list_diff[list1, list2]: out = [] for ele in list1: if not ele in list2: out.append[ele] return out # Test Input list1 = [11, 16, 21, 26, 31, 36, 41] list2 = [26, 41, 36] # Run Test print[list_diff[list1, list2]]

After running the above program, you should see the following outcome:

[11, 16, 21, 31]

Without set[], using list comprehension

It is almost a similar technique that we used in the previous one. Here, we replaced the nested loops with the list comprehension syntax.

See the example below.

""" Desc: List comprehension to find the difference between two lists in Python """ def list_diff[list1, list2]: out = [item for item in list1 if not item in list2] return out # Test Input list1 = [11, 16, 21, 26, 31, 36, 41] list2 = [26, 41, 36] # Run Test print[list_diff[list1, list2]]

After running the above program, you should see the following outcome:

[11, 16, 21, 31]

We hope that after wrapping up this tutorial, you should know several ways to check two lists for the difference. However, you may practice more with examples to gain confidence.

Also, to learn Python from scratch to depth, do read our step by step Python tutorial.

1. Using set[] function

A simple solution is to convert both lists to set a data structure and then calculate the difference using the - operator.

if __name__ == '__main__':

first = [2, 1, 3, 4, 1]

second = [3, 4, 5]

# The `set[]` function is used to create sets

diff = list[set[first] - set[second]]

print[diff]# prints [1, 2]

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