save project

diy2.py

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

dry.py

+i=3
+username = "python"
+userpassword = "123456"
+while  True:
+    if i >0 :
+        username1=input("请输入用户名：")
+        userpassword1=input("请输入密码：")
+        i-=1
+        if username==username1 and userpassword==userpassword1:
+            print("登录成功")
+            break
+            print("输入错误，请重新输入")
+        elif username != username1:
+            print("用户名不存在，请重新输入")
+        else:
+            print("密码错误，请重新输入")
+    else:
+        print("输入次数超过")        
+        exit()        
+print("欢迎来到贝尔编程!")       
+
+
+
+    
+    
\ No newline at end of file