chore: import upstream snapshot with attribution

curriculum/challenges/english/blocks/daily-coding-challenges-python/69cfca90e8a0a6d4d6871c4e.md

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+---
+id: 69cfca90e8a0a6d4d6871c4e
+title: "Challenge 264: Anagram Groups"
+challengeType: 29
+dashedName: challenge-264
+---
+
+# --description--
+
+Given an array of words, return a 2d array of the words grouped into anagrams.
+
+- Words are anagrams if they contain the same letters in any order.
+- Each word belongs to exactly one group.
+- Return order doesn't matter.
+
+For example, given `["listen", "silent", "hello", "enlist", "world"]`, return `[["listen", "silent", "enlist"], ["hello"], ["world"]]`.
+
+# --hints--
+
+`group_anagrams(["listen", "silent", "hello", "enlist", "world"])` should return `[["listen", "silent", "enlist"], ["hello"], ["world"]]`.
+
+```js
+({test: () => { runPython(`
+from unittest import TestCase
+groups = group_anagrams(["listen", "silent", "hello", "enlist", "world"])
+sorted_groups = sorted([sorted(g) for g in groups], key=lambda g: g[0])
+TestCase().assertEqual(sorted_groups, [["enlist", "listen", "silent"], ["hello"], ["world"]])`)
+}})
+```
+
+`group_anagrams(["eat", "tea", "tan", "ate", "nat", "bat"])` should return `[["ate", "eat", "tea"], ["bat"], ["nat", "tan"]]`.
+
+```js
+({test: () => { runPython(`
+from unittest import TestCase
+groups = group_anagrams(["eat", "tea", "tan", "ate", "nat", "bat"])
+sorted_groups = sorted([sorted(g) for g in groups], key=lambda g: g[0])
+TestCase().assertEqual(sorted_groups, [["ate", "eat", "tea"], ["bat"], ["nat", "tan"]])`)
+}})
+```
+
+`group_anagrams(["care", "race", "acre", "pots", "stop", "tops", "opts", "post", "spot", "evil", "vile", "live", "veil"])` should return `[["acre", "care", "race"], ["evil", "live", "veil", "vile"], ["opts", "post", "pots", "spot", "stop", "tops"]]`.
+
+```js
+({test: () => { runPython(`
+from unittest import TestCase
+groups = group_anagrams(["care", "race", "acre", "pots", "stop", "tops", "opts", "post", "spot", "evil", "vile", "live", "veil"])
+sorted_groups = sorted([sorted(g) for g in groups], key=lambda g: g[0])
+TestCase().assertEqual(sorted_groups, [["acre", "care", "race"], ["evil", "live", "veil", "vile"], ["opts", "post", "pots", "spot", "stop", "tops"]])`)
+}})
+```
+
+`group_anagrams(["algorithms", "logarithms", "education", "cautioned", "auctioned", "triangle", "integral", "alerting", "relating"])` should return `[["alerting", "integral", "relating", "triangle"], ["algorithms", "logarithms"], ["auctioned", "cautioned", "education"]]`.
+
+```js
+({test: () => { runPython(`
+from unittest import TestCase
+groups = group_anagrams(["algorithms", "logarithms", "education", "cautioned", "auctioned", "triangle", "integral", "alerting", "relating"])
+sorted_groups = sorted([sorted(g) for g in groups], key=lambda g: g[0])
+TestCase().assertEqual(sorted_groups, [["alerting", "integral", "relating", "triangle"], ["algorithms", "logarithms"], ["auctioned", "cautioned", "education"]])`)
+}})
+```
+
+# --seed--
+
+## --seed-contents--
+
+```py
+def group_anagrams(words):
+
+    return words
+```
+
+# --solutions--
+
+```py
+def group_anagrams(words):
+    groups = {}
+    for word in words:
+        key = ''.join(sorted(word))
+        if key not in groups:
+            groups[key] = []
+        groups[key].append(word)
+    return list(groups.values())
+```