save project

diy.py

 user='python'
 user='python'
 password='12345'
 password='12345'
+i=3
 while True:
 while True:
+    if i>0:
         a=input("输入用户名：")
         a=input("输入用户名：")
         b=input("输入密码：")
         b=input("输入密码：")
+        i=i-1
         if user==a and password==b:
         if user==a and password==b:
             print("登录成功！")
             print("登录成功！")
             break
             break
@@ -12,3 +15,6 @@ while True:
         if password!=b:
         if password!=b:
             print("密码错误！")
             print("密码错误！")
             continue
             continue
+    else:
+        print("系统锁定！")
+        exit()
\ No newline at end of file