save project

diy2.py

+username = "python"
+userpassword = "123456"
+i=3
+while True:
+    i-=1
+    if i<0:
+        print("你的机会误了")
+        exit() 
+    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 username!=name:
+        print("用户名不对")
+        continue
+    if userpassword!=password:
+        print("密码不正确")
+        
+print("欢迎来到贝尔编程!")   
+    
+    
+        
+