“主機是指計算機除去輸入輸出裝置以外的主要機體部分
grid(column=3, row=3, sticky=W) 上面的幾條語句在框架上(mainframe)建立了三個元件,輸入框、輸出區域(Label,用於放置轉換的結果)、轉換按鈕
<===== “Mainframe computers were very large indeed, (which were) often occupying whole air-conditioned rooms, (which