save project

diy2.py

+username = "python"
+userpassword = "123456"
+i=0
+while True:
+    if i<4:
+        i=i+1
+        name = input("请输入用户名:")
+        password = input("请输入密码:")
+        if name == username and password == userpassword:
+            break
+        elif password != userpassword:
+            print("密码错误")
+            continue
+        else:
+            print("用户名错误")
+    else:
+        print("你的账户已被锁定！")
+        exit
+print("欢迎来到贝尔编程!")
\ No newline at end of file