类约束:保存和写数据

Question

我需要保存文件并写入类。我有一些问题。

1. 保存文件时，我总是会出错，我不会这样做。我想要例外仅Wenn Necesarry，在这种情况下删除了保存的文件。

2. 使用我的代码，我无法写入文本文件。

class InterfaceApp(root):
    def __init__(self,parent):
        root.__init__(self,parent)
        self.parent = parent
        self.initialize()
    def initialize(self):
        frInstrument = Tkinter.Frame(width=800, height=200, bg="",colormap="new")
        frInstrument.grid(row=0,sticky='EW')
        # Create a custom Menu
        menu = Tkinter.Menu(self,tearoff = 0)
        self.config(menu=menu)
        filemenu = Tkinter.Menu(self,tearoff = 0)
        menu.add_cascade(label='File',menu=filemenu)
        filemenu.add_command(label='Create New File...', command = self.SaveFile())

    def SaveFile(self):
        self.dataname = asksaveasfile(mode='w', defaultextension='.txt')
        self.datamode = "a"
        try:
            self.fout = open(self.dataname, self.datamode)
        except Exception, e:
            tkMessageBox.showerror("Error", str(e))
    def Run(self):
        self.keithleyPower = rm.open_resource(self.choiceVarPower.get())
        self.keithleyMultimeter = rm.open_resource(self.choiceVarMulti.get())
        self.t = datetime.datetime.now()
        self.currdatetime = self.t.timetuple()
        self.currutime = time.mktime(self.t.timetuple())
        self.yr = str(self.currdatetime[0])
        self.curr_date = "%02d"%int(self.yr[2:]) + "%02d"%self.currdatetime[1] + "%02d"%self.currdatetime[2]
        self.curr_time = "%02d:"%self.currdatetime[3] + "%02d:"%self.currdatetime[4] + "%02d:"%self.currdatetime[5]
        self.date_time = self.curr_date + " " + self.curr_time
        self.fout.write(self.date_time+"n")

if __name__ == '__main__':
    app = InterfaceApp(None)
    app.title("LED Monitoring: Voltage rise detection")
    app.mainloop()

Answer 1

必须修复功能SaveFile。

def SaveFile(self):
        self.file_opt = self.options = {}
        self.options['filetypes'] = [('Text Files', '.txt')]
        self.dataname = asksaveasfilename(**self.file_opt)
        self.datamode = 'a'
        try:
            self.fout = open(self.dataname, self.datamode)
        except Exception, e:
            strError = "Output file open error: "+ str(e)
            tkMessageBox.showerror("Error", strError)

，您可以将数据写入文件中。

self.fout.write("data")