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Imrove frequencies snippet implementation (#234)

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Co-authored-by: Isabelle Viktoria Maciohsek <maciv@hotmail.gr>
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Azan Bin Zahid
2020-10-03 18:50:18 +05:00
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commit 9e76e8f67f
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snippets/frequencies.md
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@ -5,16 +5,12 @@ 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 a `for` loop to populate a dictionary, `f`, with the unique values in `lst` as keys, adding to existing keys every time the same value is encountered. - Use `list.count()` to get the frequency 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.
```py ```py
from functools import reduce
def frequencies(lst): def frequencies(lst):
f = {} return dict((k, lst.count(k)) for k in lst)
for x in lst:
f[x] = f[x] + 1 if x in f else 1
return f
``` ```
```py ```py