auto save

diy2.py

 username = "python"
 userpassword = "123456"
+i=3
 while True:
-    name = input("请输入用户名:")
-    password = input("请输入密码:")
-    if name == username and password == userpassword:
-        print("登录成功!")
-        break
-    if name != username:
-        print("用户名和密码错误!请重新输入")
-        continue
-
-    if password != userpassword:
-        print("恭喜你，密码错误")
+    if i>0:
+        print("你还有{}次输入的机会".format(i))
+        name = input("请输入用户名:")
+        password = input("请输入密码:")
+        i-=1
+        if name == username and password == userpassword:
+            print("登录成功!")
+            break
+        if name != username:
+            print("用户名和密码错误!请重新输入")
+            continue
+        if password != userpassword:
+            print("恭喜你，密码错误")
+    else:
+        print("你完蛋了，我报警了")
+        exit()
 print("欢迎来到贝尔编程!")