save project

diy2.py

 username = "python"
 username = "python"
 userpassword = "123456"
 userpassword = "123456"
+i=3
 while True:
 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!")
-    print("用户名和密码错误!请重新输入")
+    if i!=0:
+        name = input("请输入用户名:")
+        password = input("请输入密码:")
+        i=i-1
+        print("你还有"+str(i)+"次机会")
+        if name == username and password == userpassword:
+            print("登录成功!")
+            break
+        if name!=username:
+            print("名字错了")
+            continue
+        if password!=userpassword:
+            print("密码错误!")
+            continue
+    else:
+        print("账号已锁定")
+        exit()
 print("欢迎来到贝尔编程!")
 print("欢迎来到贝尔编程!")
\ No newline at end of file