save project

diy2.py

 username = "python"
 userpassword = "123456"
+i=3
 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!")
-        break
-    elif name!=username:
-        print('错误')
-        continue
-    elif password != userpassword:
-        print('错误')
-        continue
+    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:
+            input('错误,请输入用户名')
+            i-=1            
+        elif password != userpassword:
+            input('错误,请输入密码:')
+            i-=1
 print("欢迎来到贝尔编程!")
\ No newline at end of file