22 lines
486 B
Markdown
22 lines
486 B
Markdown
---
|
|
title: difference
|
|
tags: list,beginner
|
|
firstSeen: 2018-01-20T16:16:44+02:00
|
|
lastUpdated: 2020-11-02T19:27:53+02:00
|
|
---
|
|
|
|
Calculates the difference between two iterables, without filtering duplicate values.
|
|
|
|
- Create a `set` from `b`.
|
|
- Use a list comprehension on `a` to only keep values not contained in the previously created set, `_b`.
|
|
|
|
```py
|
|
def difference(a, b):
|
|
_b = set(b)
|
|
return [item for item in a if item not in _b]
|
|
```
|
|
|
|
```py
|
|
difference([1, 2, 3], [1, 2, 4]) # [3]
|
|
```
|