# Python | Difference between two lists

There are various ways in which difference between two lists can be generated. In this article, we will see 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
```

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

1. 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:

 `# Python code t get difference of two lists ` `# Using set() ` `def` `Diff(li1, li2): ` `    ``return` `(``list``(``set``(li1) ``-` `set``(li2))) ` ` `  `# Driver Code ` `li1 ``=` `[``10``, ``15``, ``20``, ``25``, ``30``, ``35``, ``40``] ` `li2 ``=` `[``25``, ``40``, ``35``] ` `print``(Diff(li1, li2)) `

Output :

`[10, 20, 30, 15]`
2. 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.

 `# 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]`

My Personal Notes arrow_drop_up Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.

Article Tags :
Practice Tags :

Be the First to upvote.

Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.