save project

diy2.py

+username = "python"
+userpassword = "123456"
+i=3
+while True:
+    if i>=0:
+        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
+        elif name!=username:
+        i-=1
+        else:
+            print("用户名错误")
+            print("你还有+str(i)+次机会")
+    else:
+        print("账号锁定")
+        exit()
+print("欢迎来到贝尔编程!")
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