Send value from python GUI to an external file

Question

I need to have values from 2 sliders in a python GUI sent to an external file (just a text or csv file).Can anyone help? Cheers Alasdair

Short answer: When the value is available, open the file, write the value, and then close it. Does that not work for some reason? — martineau
– martineau, Commented Dec 5, 2010 at 18:35

K. Brafford · Accepted Answer · 2010-12-05 18:32:35Z

2

Here's a quick example using wx.Python:

import wx

class MyPanel(wx.Panel):
    def __init__(self, parent, id = -1):
        wx.Panel.__init__(self, parent, id)

        self.slider1 = wx.Slider(self, -1, 50, 0, 100, size=(300,25))
        self.slider2 = wx.Slider(self, -1, 50, 0, 100, size=(300,25))

        self.button = wx.Button(self, -1, "Write Values")
        self.Bind(wx.EVT_BUTTON, self.onWrite)

        #  Uncomment the next two lines if you want to write the
        #  data out every time you move the slider
        #self.Bind(wx.EVT_SLIDER, self.onWrite)
        #self.onWrite()

        self.sizer = wx.BoxSizer(wx.VERTICAL)
        self.sizer.AddStretchSpacer(1)
        self.sizer.Add(self.slider1, 0, wx.ALIGN_CENTER_HORIZONTAL)
        self.sizer.AddSpacer(50)
        self.sizer.Add(self.slider2, 0, wx.ALIGN_CENTER_HORIZONTAL)
        self.sizer.AddSpacer(75)
        self.sizer.Add(self.button, 0, wx.ALIGN_CENTER_HORIZONTAL)
        self.sizer.AddStretchSpacer(1)
        self.SetSizerAndFit(self.sizer)

    def onWrite(self, event = None):
        v1 = self.slider1.GetValue()
        v2 = self.slider2.GetValue()
        f = open("file.csv", "w")
        line = "%d, %d\n" %(v1, v2)
        f.write(line)
        f.close()
        print "Just wrote", line


if __name__ == "__main__":
    a = wx.PySimpleApp()
    f = wx.Frame(None,-1, "Slider Demo")
    p = MyPanel(f)
    f.Show()
    a.MainLoop()

edited Dec 5, 2010 at 18:32

answered Dec 5, 2010 at 18:22

K. Brafford

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2 Comments

khachik Over a year ago

@K. Brafford It writes to the file on each slide event?

K. Brafford Over a year ago

Good point. I wasn't sure based on the question, so I figured I'd show how to get notified of the slider changes. I modded the example to write deliberately via button press.

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