save project

diy.py

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