[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

strings/anagrams.py

@@ -17,7 +17,9 @@ def signature(word: str) -> str:
     'a1e1f1i1l1n1s1t2'
     """
     frequencies = collections.Counter(word)
-    return "".join(f"{char}{frequency}" for char, frequency in sorted(frequencies.items()))
+    return "".join(
+        f"{char}{frequency}" for char, frequency in sorted(frequencies.items())
+    )
 
 
 def anagram(my_word: str) -> list[str]: