{"code":"icpc21pythonfile","name":"Python File","description":"A file name consists of $2$ parts: base name and extension name, separated by a dot character. For example, Python\r\nsource code files have extension name \"py\", documents have extension name \"doc\" or \"docx\". In Windows OS, file\r\nnames are case insensitive.\r\n\r\nWrite a program to input a file name as string and check whether it is considered Python source code file in\r\nWindows or not.\r\n\r\n<h4>Input</h4>\r\n\r\n- Only one line contain file name $S (1 < |S| < 128)$. File name will only contain ’a’-’z’,’A’-’Z’,’’ and’_’.\r\n\r\n<h4>Output</h4>\r\n\r\n- If file is a python file, print \"yes\", otherwise \"no\".\r\n\r\n<h4>Example</h4>\r\n\r\n!!! question \"Test 1\"\r\n\r\n    ???+ \"Input\"\r\n\r\n        ```sample\r\n        abc.py\r\n        ```\r\n\r\n    ???+ success \"Output\"\r\n\r\n        ```sample\r\n        yes\r\n        ```\r\n\r\n!!! question \"Test 2\"\r\n\r\n    ???+ \"Input\"\r\n\r\n        ```sample\r\n        abc.bin\r\n        ```\r\n\r\n    ???+ success \"Output\"\r\n\r\n        ```sample\r\n        no\r\n        ```","points":400.0,"partial":false,"time_limit":1.0,"memory_limit":262144,"short_circuit":false,"allowed_languages":[3,4,34,36,37,5,6,11,12,14,28,2,38,39,9,18,17,29,23,27,35,25,26,10,7,19,32,1,8,15,16,24,20,33,13,41,21,40],"is_public":true,"is_manually_managed":false,"permissions":{"can_edit":false}}