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68 lines
2.0 KiB
Markdown
68 lines
2.0 KiB
Markdown
---
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id: 68ffb91507a5b645769328c8
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title: "Challenge 105: Character Count"
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challengeType: 29
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dashedName: challenge-105
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---
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# --description--
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Given a sentence string, return an array with a count of each character in alphabetical order.
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- Treat upper and lowercase letters as the same letter when counting.
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- Ignore numbers, spaces, punctuation, etc.
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- Return the count and letter in the format `"letter count"`. For instance, `"a 3"`.
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- All returned letters should be lowercase.
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- Do not return a count of letters that are not in the given string.
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# --hints--
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`count_characters("hello world")` should return `["d 1", "e 1", "h 1", "l 3", "o 2", "r 1", "w 1"]`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(count_characters("hello world"), ["d 1", "e 1", "h 1", "l 3", "o 2", "r 1", "w 1"])`)
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}})
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```
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`count_characters("I love coding challenges!")` should return `["a 1", "c 2", "d 1", "e 3", "g 2", "h 1", "i 2", "l 3", "n 2", "o 2", "s 1", "v 1"]`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(count_characters("I love coding challenges!"), ["a 1", "c 2", "d 1", "e 3", "g 2", "h 1", "i 2", "l 3", "n 2", "o 2", "s 1", "v 1"])`)
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}})
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```
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`count_characters("// TODO: Complete this challenge ASAP!")` should return `["a 3", "c 2", "d 1", "e 4", "g 1", "h 2", "i 1", "l 3", "m 1", "n 1", "o 3", "p 2", "s 2", "t 3"]`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(count_characters("// TODO: Complete this challenge ASAP!"), ["a 3", "c 2", "d 1", "e 4", "g 1", "h 2", "i 1", "l 3", "m 1", "n 1", "o 3", "p 2", "s 2", "t 3"])`)
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}})
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```
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# --seed--
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## --seed-contents--
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```py
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def count_characters(sentence):
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return sentence
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```
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# --solutions--
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```py
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def count_characters(sentence):
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from collections import Counter
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letters = [c.lower() for c in sentence if c.isalpha()]
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counts = Counter(letters)
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return [f"{letter} {counts[letter]}" for letter in sorted(counts)]
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```
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