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93 lines
2.5 KiB
Markdown
93 lines
2.5 KiB
Markdown
---
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id: 698a1a73ade5ac0e19180fa3
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title: "Challenge 200: Letter and Number Count"
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challengeType: 29
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dashedName: challenge-200
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---
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# --description--
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Given a string, return a message with the count of how many letters and numbers it contains.
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- Letters are `A-Z` and `a-z`.
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- Numbers are `0-9`.
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- Ignore all other characters.
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Return `"The string has X letters and Y numbers."`, where `"X"` is the count of letters and `"Y"` is the count of numbers. If either count is 1, use the singular form for that item. E.g: `"1 letter"` instead of `"1 letters"` and `"1 number"` instead of `"1 numbers"`.
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# --hints--
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`count_letters_and_numbers("helloworld123")` should return `"The string has 10 letters and 3 numbers."`.
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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_letters_and_numbers("helloworld123"), "The string has 10 letters and 3 numbers.")`)
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}})
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```
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`count_letters_and_numbers("Catch 22")` should return `"The string has 5 letters and 2 numbers."`.
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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_letters_and_numbers("Catch 22"), "The string has 5 letters and 2 numbers.")`)
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}})
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```
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`count_letters_and_numbers("A1!")` should return `"The string has 1 letter and 1 number."`.
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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_letters_and_numbers("A1!"), "The string has 1 letter and 1 number.")`)
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}})
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```
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`count_letters_and_numbers("12345")` should return `"The string has 0 letters and 5 numbers."`.
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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_letters_and_numbers("12345"), "The string has 0 letters and 5 numbers.")`)
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}})
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```
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`count_letters_and_numbers("password")` should return `"The string has 8 letters and 0 numbers."`.
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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_letters_and_numbers("password"), "The string has 8 letters and 0 numbers.")`)
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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_letters_and_numbers(s):
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return s
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```
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# --solutions--
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```py
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def count_letters_and_numbers(s):
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letter_count = 0
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number_count = 0
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for char in s:
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if ('A' <= char <= 'Z') or ('a' <= char <= 'z'):
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letter_count += 1
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elif '0' <= char <= '9':
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number_count += 1
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letter_word = "letter" if letter_count == 1 else "letters"
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number_word = "number" if number_count == 1 else "numbers"
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return f"The string has {letter_count} {letter_word} and {number_count} {number_word}."
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```
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