如何填写具有另一个功能的列？

Question

我有一个如下所示的数据框：

我意识到func TableHandler(mux http.ServeMux) { mux.HandleFunc("/gpdp/v1/prices/", func(w http.ResponseWriter, r *http.Request) log.Println("request for prices: ", r.Method, r.Body) ...} 列可以通过 public void GetFiles() { ds.Clear(); this.dgArchivos.DataSource = null; this.dgArchivos.Rows.Clear(); this.dgArchivos.Refresh(); filesPath = Clases.Utilerias.RutaArchivos; this.lblFilePath.Text = filesPath; DirectoryInfo di = new DirectoryInfo(filesPath); var archivos = di.GetFiles("*.pdf"); DataRow dr; //PASO 1 -- Cargamos el XML string rutaConfig = string.Format(@"{0}\{1}", filesPath, "config.xml"); FileInfo fi = new FileInfo(rutaConfig); if (fi.Exists) { ds.ReadXml(rutaConfig); } //PASO 2 -- Agregamos los archivos que no existan en el xml foreach (var archivo in archivos) { if (!ExisteArchivoEnTabla(archivo.Name)) //antes de cargar los archivos a la tabla es necesario revisar si ya existe en ella { dr = ds.Tables[0].NewRow(); dr["FileName"] = archivo.Name; ds.Tables[0].Rows.Add(dr); } } this.dgArchivos.DataSource = ds.Tables[0]; if (dgArchivos.Rows.Count > 0) { int Total = (dgArchivos.Rows[0].Cells.Count - 2); dgArchivos.Columns[Total].DefaultCellStyle.NullValue = "Preview"; } this.getFRunning = false; } 的函数生成 确切地说：using System; using System.IO; using System.Security.Permissions; using ScanScraping.App; namespace ScanScraping.Clases { public class FileWatcher { public static frmProcessFile frm; public FileWatcher(frmProcessFile process) { frm = process; Run(); } [PermissionSet(SecurityAction.Demand, Name = "FullTrust")] public static void Run() { // Create a new FileSystemWatcher and set its properties. FileSystemWatcher watcher = new FileSystemWatcher(); watcher.Path = Clases.Utilerias.RutaArchivos; /* Watch for changes in LastAccess and LastWrite times, and the renaming of files or directories. */ watcher.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite | NotifyFilters.FileName | NotifyFilters.DirectoryName; // Only watch text files. watcher.Filter = "*.pdf"; // Add event handlers. watcher.Created += new FileSystemEventHandler(OnChanged); watcher.Deleted += new FileSystemEventHandler(OnDeleted); // Begin watching. watcher.EnableRaisingEvents = true; // Wait for the user to quit the program. } // Define the event handlers. private static void OnChanged(object source, FileSystemEventArgs e) { // Specify what is done when a file is changed, created, or deleted. Console.WriteLine("File: " + e.FullPath + " " + e.ChangeType); frm.formPadre.xmlCreateOrUpdate(); frm.GetFiles(); } public static void OnDeleted(object source, FileSystemEventArgs e) { Console.WriteLine("File: " + e.FullPath + " " + e.ChangeType); string[] file = e.FullPath.Split('\\'); string fName = file[file.Length - 1]; frm.updateXML(fName); frm.GetFiles(); } private static void OnRenamed(object source, RenamedEventArgs e) { // Specify what is done when a file is renamed. Console.WriteLine("File: {0} renamed to {1}", e.OldFullPath, e.FullPath); frm.formPadre.xmlCreateOrUpdate(); frm.GetFiles(); } } }

//rdo-nav-card-asset/div[contains(@class,'panel') and contains(@class,'highlight')]/div[contains(@class,'panel-heading')]/div[contains(@class,'panel-title')] 列中有day_charge个值，如何使用上述函数填充day_mins值？

Answer 1

由于您的列始终为day_mins * .17，因此在您的情况下，替换整列可能更容易，更快：

df['day_charge'] = df['day_mins'] * 0.17

但@jpp的解决方案实际上解决了如何使用给定函数填充NaN的问题。

Answer 2

您可以使用pd.Series.fillna填写缺失值：

{{1}}