save project

diy2.py

 username = "python"
 userpassword = "123456"
-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
-    else:
-    if name != username:
-        print("用户名错误!请重新输入")
-    else:
-        if password == userpassword and password != userpassword:
-            print("密码错误!请重新输入")
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+i = 3
+if i<0:
+    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
+        else:
+            if name != username:
+                print("用户名错误!请重新输入")
+                i-=1
+            else:
+                if password == userpassword and password != userpassword:
+                    print("密码错误!请重新输入")
+else:
+    print("您已被锁定")
+    exit()
+print("欢迎")
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