save project

m.py

 username = "python"
 username = "python"
 userpassword = "123456"
 userpassword = "123456"
-x=input("请输入账号：")
-y=input("请输入密码：")
-if x==username and y==userpassword:
+while True:
+    x=input("请输入账号：")
+    y=input("请输入密码：")
+    if x==username and y==userpassword:
         print("密码正确")
         print("密码正确")
-else:
+        break
+    else:
         print("密码错误")
         print("密码错误")
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