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]
Article Tags :
Python
python-list
python-set
Practice Tags :
python-list
python-set
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The popular numpy library is often used for working in data science, and, as such, comes bundled with a ton of different helpful methods to manipulate numerical data. One of the primary advantages that numpy provides is the array object, which is very similar to the Python list object.
One of the methods that numpy provides is the subtract[] method. The method takes two numpy arrays as input and provides element-wise subtractions between the two lists.
Let’s see how we can use numpy and Python to subtract two lists:
# Subtract two lists with numpy
import numpy as np list1 = [10, 11, 12]
list2 = [1, 2, 3] array1 = np.array[list1]
array2 = np.array[list2] subtracted_array = np.subtract[array1, array2]
subtracted = list[subtracted_array] print[subtracted] # Returns: [9, 9, 9]
Let’s take a look at what we’ve done here:
- We loaded our two lists, list1 and list2 and converted them into numpy arrays, array1 and array2
- We then used the np.subtract[] method to subtract the two lists
- Finally, since we want to return a Python list, we used the list[] method
In the next section, you’ll learn how to use the zip[] function to find the different between two lists element-wise.
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In this method, we’ll pass the two input lists to the Zip Function. Then, iterate over the zip object using for loop. On every iteration, the program will take an element from list1 and list2, subtract them and append the result into another list.
Example 1:
# Create and initialize two lists list1 = [9,1,3,7]
list2 = [4,4,5,6] #initialize a variable which will store the difference of two lists
result = [] for i, j in zip[list1,list2]: result.append[i - j] print[result]
OUTPUT:
[5, -3, -2, 1]
Another way to subtract two lists is by using list comprehension. For this, you need to traverse over the lists and perform subtraction one by one all elements as shown in the code snippet below.
#create and initialize two lists list1 = [9,1,3] list2 = [4,4,5] #perform subtraction and store the result in "difference" difference = [List1[i]-List2[i] for i in range[min[len[list1], len[List2]]]] #print the difference of two lists print[difference]
Output:
[5, -3, -2]
Python Python List
Created: November-16, 2020 | Updated: July-18, 2021
This tutorial demonstrates how to perform the list subtraction, or in other words, list minus list in Python.
As defined by the set theory in mathematics, the difference of two sets refers to the elements from one set that do not exist in the other set.
For example, if we declare these two lists:
list1 = [1, 2, 4]
list2 = [2, 3]
The difference of list1 - list2 would be [1, 4], while list2 - list1 would be [3].
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