更新代码规范

problems/0242.有效的字母异位词.md

@@ -137,16 +137,16 @@ class Solution:
     def isAnagram(self, s: str, t: str) -> bool:
         from collections import defaultdict
         
-        s_dict=defaultdict(int)
+        s_dict = defaultdict(int)
-        t_dict=defaultdict(int)
+        t_dict = defaultdict(int)
 
         for x in s:
-            s_dict[x]+=1
+            s_dict[x] += 1
         
         for x in t:
-            t_dict[x]+=1
+            t_dict[x] += 1
 
-        return s_dict==t_dict
+        return s_dict == t_dict
 ```
 
 Go：