auto save

diy.py

+dict={"张三":55,"李四":60,"王五":70}
+dict["李四"]=80
+dict["赵六"]=99
+
+
+if "赵六" in dict:
+    print(dict["赵六"])
+print(dict)
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diy1.py

+python1={"李":98,"王":99,"星":100,"颜":80} #创建班级字典,人名为键 语文成绩为值  李:98 王:99 星:100 颜:80  python1
+python1["颜"]=100                         #修改颜同学的语文成绩
+print(python1["颜"])                      #查看颜同学的语文成绩
+if "刘" in python1:                       #查看刘同学的成绩是否在班级中，如果在就输出所有人成绩，
+    print(python1)                       
+else:                                     #如果不在就添加到班级中并且输出所有人成绩
+    python1["刘"]=100                      
+    print(python1)
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