save project

diy2.py

+N="python"
+P = "123456"
+while True:
+    n=input("请输入用户名:")
+    p=input("请输入密码:")
+    if n!=N:
+        print("用户不存在")
+    if p!=P:
+        print("密码错误")
+    if n==N and p==P:    
+        print("登录成功!")
+        break
+print("欢迎来到贝尔编程!")
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