save project

diy2.py

+i=3
 username = "python"
 username = "python"
 userpassword = "123456"
 userpassword = "123456"
 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!")
-        break
-    if name != username:
-        print("用户名不存在，请重新输入") 
-        continue
-    if password != userpassword:
-        print("密码输入有误，请重新输入")
-    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:")
+        if name == username and password == userpassword:
+            print("登录成功!")
+            break
+        if name != username:
+            print("用户名不存在，请重新输入") 
+            continue
+        if password != userpassword:
+            print("密码输入有误，请重新输入")
+    else:
+        
 print("欢迎来到贝尔编程!")
 print("欢迎来到贝尔编程!")