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Improve filter functions

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Pablo Baeyens
2020-01-04 14:29:42 +01:00
parent 2ba974cd2d
commit 8911146de1
2 changed files with 12 additions and 4 deletions
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8
snippets/filter_non_unique.md
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@ -5,11 +5,15 @@ tags: list,beginner
Filters out the non-unique values in a list. Filters out the non-unique values in a list.
Use list comprehension and `list.count()` to create a list containing only the unique values. Use `Counter` to get the count of each value in the list.
Use list comprehension to create a list containing only the unique values.
```py ```py
from collections import Counter
def filter_non_unique(lst): def filter_non_unique(lst):
return [item for item in lst if lst.count(item) == 1] counter = Counter(lst)
return [item for item, count in counter.items() if count == 1]
``` ```
```py ```py

8
snippets/filter_unique.md
View File

@ -5,11 +5,15 @@ tags: list,beginner
Filters out the unique values in a list. Filters out the unique values in a list.
Use list comprehension and `list.count()` to create a list containing only the non-unique values. Use `Counter` to get the count of each value in the list.
Use list comprehension to create a list containing only the non-unique values.
```py ```py
from collections import Counter
def filter_unique(lst): def filter_unique(lst):
return [x for x in set(item for item in lst if lst.count(item) > 1)] counter = Counter(lst)
return [item for item, count in counter.items() if count > 1]
``` ```
```py ```py