completed challenge to create anagram list from an array of strings

Author: RBIII

anagram_list.py

@@ -0,0 +1,34 @@
+def group_anagrams(words):
+    anagram_list = []
+    letter_counts = {}
+    already_included = set()
+    next_word = 1
+
+    for word in words:
+        letter_counts[word] = {}
+        
+        for letter in list(word):
+            if letter in letter_counts[word]:
+                letter_counts[word][letter] += 1
+            else:
+                letter_counts[word][letter] = 1
+
+    for word in letter_counts:
+        if word in already_included:
+            next_word += 1
+            continue
+
+        anagrams = {word}
+
+        for index in range(next_word, len(letter_counts) - 1):
+            possible_anagram = list(letter_counts)[index]
+
+            if letter_counts[word] == letter_counts[possible_anagram]:
+                anagrams.add(possible_anagram)
+                already_included.add(possible_anagram)
+                
+            index += 1
+
+        anagram_list.append(anagrams)
+    
+    return anagram_list