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105 lines
2.4 KiB
Markdown
105 lines
2.4 KiB
Markdown
---
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id: 6a22d77ddf034bc4e35b1d5a
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title: "Challenge 353: Contrast Rating 2"
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challengeType: 29
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dashedName: challenge-353
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---
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# --description--
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Given two relative luminance values and a boolean indicating whether the text is large, return the WCAG contrast rating using the following method:
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Calculate the contrast ratio by adding 0.05 to each luminance value, then dividing the lighter one by the darker one. The lighter one will always be the first argument.
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Return the rating based on the contrast ratio using the following table:
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| Rating | Normal Text | Large Text |
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|--------|-------------|------------|
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| `"AAA"` | 7.0+ | 4.5+ |
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| `"AA"` | 4.5+ | 3.0+ |
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| `"Fail"` | below 4.5 | below 3.0 |
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# --hints--
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`get_contrast_rating(1.0, 0.0, False)` should return `"AAA"`.
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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(get_contrast_rating(1.0, 0.0, False), "AAA")`)
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}})
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```
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`get_contrast_rating(0.9015, 0.1364, False)` should return `"AA"`.
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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(get_contrast_rating(0.9015, 0.1364, False), "AA")`)
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}})
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```
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`get_contrast_rating(0.8965, 0.1628, False)` should return `"Fail"`.
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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(get_contrast_rating(0.8965, 0.1628, False), "Fail")`)
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}})
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```
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`get_contrast_rating(0.7469, 0.0957, True)` should return `"AAA"`.
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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(get_contrast_rating(0.7469, 0.0957, True), "AAA")`)
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}})
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```
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`get_contrast_rating(0.7489, 0.2018, True)` should return `"AA"`.
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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(get_contrast_rating(0.7489, 0.2018, True), "AA")`)
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}})
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```
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`get_contrast_rating(0.6571, 0.1974, True)` should return `"Fail"`.
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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(get_contrast_rating(0.6571, 0.1974, True), "Fail")`)
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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 get_contrast_rating(l1, l2, is_large_text):
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return l1
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```
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# --solutions--
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```py
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def get_contrast_rating(l1, l2, is_large_text):
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ratio = (l1 + 0.05) / (l2 + 0.05)
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if is_large_text:
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if ratio >= 4.5:
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return "AAA"
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if ratio >= 3.0:
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return "AA"
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else:
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if ratio >= 7.0:
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return "AAA"
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if ratio >= 4.5:
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return "AA"
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return "Fail"
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```
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