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87 lines
2.1 KiB
Markdown
87 lines
2.1 KiB
Markdown
---
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id: 691b559495c5cb5a37b9b480
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title: "Challenge 120: Pounds to Kilograms"
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challengeType: 29
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dashedName: challenge-120
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---
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# --description--
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Given a weight in pounds as a number, return the string `"(lbs) pounds equals (kgs) kilograms."`.
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- Replace `"(lbs)"` with the input number.
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- Replace `"(kgs)"` with the input converted to kilograms, rounded to two decimals and always include two decimal places in the value.
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- 1 pound equals 0.453592 kilograms.
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- If the input is `1`, use `"pound"` instead of `"pounds"`.
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- If the converted value is `1`, use `"kilogram"` instead of `"kilograms"`.
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# --hints--
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`convert_to_kgs(1)` should return `"1 pound equals 0.45 kilograms."`.
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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(convert_to_kgs(1), "1 pound equals 0.45 kilograms.")`)
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}})
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```
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`convert_to_kgs(0)` should return `"0 pounds equals 0.00 kilograms."`.
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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(convert_to_kgs(0), "0 pounds equals 0.00 kilograms.")`)
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}})
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```
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`convert_to_kgs(100)` should return `"100 pounds equals 45.36 kilograms."`.
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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(convert_to_kgs(100), "100 pounds equals 45.36 kilograms.")`)
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}})
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```
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`convert_to_kgs(2.5)` should return `"2.5 pounds equals 1.13 kilograms."`.
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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(convert_to_kgs(2.5), "2.5 pounds equals 1.13 kilograms.")`)
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}})
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```
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`convert_to_kgs(2.20462)` should return `"2.20462 pounds equals 1.00 kilogram."`.
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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(convert_to_kgs(2.20462), "2.20462 pounds equals 1.00 kilogram.")`)
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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 convert_to_kgs(lbs):
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return lbs
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```
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# --solutions--
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```py
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def convert_to_kgs(lbs):
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KG_PER_POUND = 0.453592
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kgs = f"{lbs * KG_PER_POUND:.2f}"
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pound_word = "pound" if lbs == 1 else "pounds"
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kilogram_word = "kilogram" if kgs == "1.00" else "kilograms"
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return f"{lbs} {pound_word} equals {kgs} {kilogram_word}."
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```
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