chore: import upstream snapshot with attribution

curriculum/challenges/english/blocks/daily-coding-challenges-python/6a22d77ddf034bc4e35b1d5a.md

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+---
+id: 6a22d77ddf034bc4e35b1d5a
+title: "Challenge 353: Contrast Rating 2"
+challengeType: 29
+dashedName: challenge-353
+---
+
+# --description--
+
+Given two relative luminance values and a boolean indicating whether the text is large, return the WCAG contrast rating using the following method:
+
+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.
+
+Return the rating based on the contrast ratio using the following table:
+
+| Rating | Normal Text | Large Text |
+|--------|-------------|------------|
+| `"AAA"` | 7.0+ | 4.5+ |
+| `"AA"` | 4.5+ | 3.0+ |
+| `"Fail"` | below 4.5 | below 3.0 |
+
+# --hints--
+
+`get_contrast_rating(1.0, 0.0, False)` should return `"AAA"`.
+
+```js
+({test: () => { runPython(`
+from unittest import TestCase
+TestCase().assertEqual(get_contrast_rating(1.0, 0.0, False), "AAA")`)
+}})
+```
+
+`get_contrast_rating(0.9015, 0.1364, False)` should return `"AA"`.
+
+```js
+({test: () => { runPython(`
+from unittest import TestCase
+TestCase().assertEqual(get_contrast_rating(0.9015, 0.1364, False), "AA")`)
+}})
+```
+
+`get_contrast_rating(0.8965, 0.1628, False)` should return `"Fail"`.
+
+```js
+({test: () => { runPython(`
+from unittest import TestCase
+TestCase().assertEqual(get_contrast_rating(0.8965, 0.1628, False), "Fail")`)
+}})
+```
+
+`get_contrast_rating(0.7469, 0.0957, True)` should return `"AAA"`.
+
+```js
+({test: () => { runPython(`
+from unittest import TestCase
+TestCase().assertEqual(get_contrast_rating(0.7469, 0.0957, True), "AAA")`)
+}})
+```
+
+`get_contrast_rating(0.7489, 0.2018, True)` should return `"AA"`.
+
+```js
+({test: () => { runPython(`
+from unittest import TestCase
+TestCase().assertEqual(get_contrast_rating(0.7489, 0.2018, True), "AA")`)
+}})
+```
+
+`get_contrast_rating(0.6571, 0.1974, True)` should return `"Fail"`.
+
+```js
+({test: () => { runPython(`
+from unittest import TestCase
+TestCase().assertEqual(get_contrast_rating(0.6571, 0.1974, True), "Fail")`)
+}})
+```
+
+# --seed--
+
+## --seed-contents--
+
+```py
+def get_contrast_rating(l1, l2, is_large_text):
+
+    return l1
+```
+
+# --solutions--
+
+```py
+def get_contrast_rating(l1, l2, is_large_text):
+    ratio = (l1 + 0.05) / (l2 + 0.05)
+    if is_large_text:
+        if ratio >= 4.5:
+            return "AAA"
+        if ratio >= 3.0:
+            return "AA"
+    else:
+        if ratio >= 7.0:
+            return "AAA"
+        if ratio >= 4.5:
+            return "AA"
+    return "Fail"
+```