diff --git a/diy1.py b/diy1.py
index eefeb2c..09f4361 100644
--- a/diy1.py
+++ b/diy1.py
@@ -3,14 +3,14 @@
 
 scores = {'语文':89, '数学':95, '英语':80}
 
-def get_average(dict_1)):
-    score = 0
+def get_average(dict_1):
+    sum       _score = 0
 
     for subject, score in scores.items():
 
-        score += score
-        print('现在的总分是%d'%score)
-    ave_score = score/len(scores)
+        sum_score += score
+        print('现在的总分是%d'%sum_score)
+    ave_score = sum_score/len(scores)
     print('平均分是%d'%ave_score)
 
 get_average(scores)
\ No newline at end of file
diff --git a/diy4.py b/diy4.py
new file mode 100644
index 0000000..af41d54
--- /dev/null
+++ b/diy4.py
@@ -0,0 +1 @@
+print((89+95+80)/3)