save project

diy2.py

+username = "cy"
+userpassword = "nmsl"
+while True:
+    name = input("输用户名:")
+    password = input("输密码:")
+    if name == username and password == userpassword:
+        print("登录成功!")
+        break
+    if name != username:
+        print("nmsl!用户错了!")
+        continue
+    if password != userpassword:
+        print("nmsl!密码错了!")
+print("welcome to nmsl !")      
+