save project

diy2.py

+username = "1"
+userpassword = "2"
+while True:
+    a = input("请输入用户名:")
+    b = input("请输入密码:")
+    if a == username :
+        if b == userpassword:
+            print("登录成功!")
+            break
+        else:    
+            print("密码错误!请重新输入")            
+    else:    
+        print("用户名错误 请重新输入")
+        
+print("欢迎来到贝尔编程!")
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