save project

diy1.py

+username="python"
+userpassword="123456"
+while True:
+    name=input("请输入用户名:")
+    password=input("请输入密码")
+    if name==username and password==userpassword:
+        print("登入成功")
+        break
+    if name!=username:
+        print("用户名错误,请重新输入!")
+        continue
+    if password!=userpassword:
+        print("密码错误，请重新输入!")