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Update frequencies.md

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Isabelle Viktoria Maciohsek
2020-10-16 20:37:50 +03:00
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parent 2da7bcd612
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snippets/frequencies.md
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@ -6,14 +6,15 @@ tags: list,intermediate
Returns a dictionary with the unique values of a list as keys and their frequencies as the values. Returns a dictionary with the unique values of a list as keys and their frequencies as the values.
- Use `collections.defaultdict()` to store the frequencies of each unique element. - Use `collections.defaultdict()` to store the frequencies of each unique element.
- Use `dict()` constructor to return a dictionary with the unique elements of the list as keys and their frequencies as the values. - Use `dict()` to return a dictionary with the unique elements of the list as keys and their frequencies as the values.
```py ```py
from collections import defaultdict from collections import defaultdict
def frequencies(lst): def frequencies(lst):
freq = defaultdict(int) freq = defaultdict(int)
for val in lst: for val in lst:
freq[val]+=1 freq[val] += 1
return dict(freq) return dict(freq)
``` ```