save project

diy2.py

- i=3
+i=3
 username = "python"
-
 userpassword = "123456"
-while True:
-    i>0
-    name = input("请输入用户名:")
-    password = input("请输入密码:")
-    i-=1
-    if name == username and password == userpassword:
+while True:  
+    if  i>0:
+        name = input("请输入用户名:")
+        password = input("请输入密码:")
+        i-=1
+        if name == username and password == userpassword:
     
-        print("登录成功!")
-        break
-    print("用户名和密码错误!请重新输入")
-    if  name != username :
-        print("用户名错误!请重新输入")
-    elif :
-        print("密码错误!请重新输入")
-    elif :
+            print("登录成功!")
+            break
+        if  name != username:
+            print("用户名错误!请重新输入")
+        
+            print("密码错误!请重新输入")
+        else:
+            print("密码错误!请重新输入")
+    else:
         print("错误")
-exit()        
+        exit()        
 print("欢迎来到贝尔编程!")
\ No newline at end of file