#?文件循環(huán).pydef?main()?:????fileName?=?input('輸入文件名：')????infile?=?open(fileName?,?'r')??????Sum?=?0????count?=?0????for?line?in?infile?:????????#?數(shù)據(jù)以每行一個的形式存儲在文件中????????Sum?=?Sum?+?eval(line)????????count?=?count?+1????print('\n文件數(shù)據(jù)之和為',Sum?/?count)main()但找不到文件，是怎么回事