auto save

diy2.py

+stu={"赵":80,"钱":90,"孙":70,"李":75}
+k=input("请输入您的姓名：")
+v=int(input("请输入您的成绩："))
+if k in stu:
+    if v>stu[k]:
+        stu[k]=v
+        print(stu)
+    else:
+        print("您的成绩不用修改...")
+else:
+    stu[k]=v
+    print(stu)
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