auto save

diy2.py

+#保存用户数据
+i=3
+username= "python"
+userpassword = "123456"
+#判断
+while True:
+    if i==3:
+        name = input("你账号是？")
+        if name == username:
+            password = input("你密码是？") 
+            if password == userpassword:
+                print("登陆成功")
+                break
+            if password != userpassword:
+                print("密码错误"+"你还有"+ str(i)+ "次机会")
+                i-= 1   
+        if name != username:
+            print("账户错误")
+            i-= 1  
+            continue 
+print("欢迎")
\ No newline at end of file