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diy1.py

@@ -3,12 +3,13 @@
 
 
 scores = {'语文':89, '数学':95, '英语':80}
 scores = {'语文':89, '数学':95, '英语':80}
 
 
-def get_average(scores):
+def get_average(scores):#scores还是一个字典，表示三科成绩
     score = 0  
     score = 0  
-    for subject, score in scores.items():
-        score += score
-        print('现在的总分是%d'%score)
-    ave_score = score/len(scores)
+    sum1 = 0 #表示总分 
+    for subject, score in scores.items():#遍历字典scores的键值对  subject键  score值
+        sum1 += score# 总分  如果还是score得话，单科成绩和总分会发生冲突
+        print('现在的总分是%d'%sum1)
+    ave_score = sum1 / len(scores)
     print('平均分是%d'%ave_score)
     print('平均分是%d'%ave_score)
 
 
 get_average(scores)
 get_average(scores)
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