Major Help with the wxPython

Question

GihanFernando 0 Newbie Poster

14 Years Ago

Hello all,

I would really appreciate help with this seemingly basic problem.

Here is my code;

import wx
import FloatSpin as FS

class DesignConditions(wx.Frame):

    def __init__(self,parent,id):
        wx.Frame.__init__(self,parent,id,'Design Conditions',size=(1000,700))
        panel = wx.Panel(self)

        wx.StaticText(panel,-1,'Atmospheric Temperature  (K): ', (25,150))
        wx.StaticText(panel,-1,'Atmospheric Pressure  (kPa): ', (25,200))
        wx.StaticText(panel,-1,'Mach Number: ', (25,250))
        wx.StaticText(panel,-1,'Ratio of Specific Heat Capacities (k) of AIR: ', (25,300))
        wx.StaticText(panel,-1,'Ratio of Specific Heat Capacities (k) of EXHAUST: ', (25,350))
        wx.StaticText(panel,-1,'Gas co-efficient Constant (R - KJ/kg.K) of AIR: ', (25,400))
        wx.StaticText(panel,-1,'Gas co-efficient Constant (R - KJ/kg.K) of EXHAUST: ', (25,450))

        self.temp = FS.FloatSpin(panel,-1,min_val=200,max_val=300,increment=0.01,value=0.01,pos=(200,150))
        self.temp.SetFormat("%f")
        self.temp.SetDigits(3)

        self.pres = FS.FloatSpin(panel,-1,min_val=10,max_val=110,increment=0.01,value=0.01,pos=(200,200))
        self.pres.SetFormat("%f")
        self.pres.SetDigits(3)

        self.mach = FS.FloatSpin(panel,-1,min_val=0,max_val=10,increment=0.01,value=0.01,pos=(200,250))
        self.mach.SetFormat("%f")
        self.mach.SetDigits(3)

        self.K = FS.FloatSpin(panel,-1,min_val=1,max_val=3,increment=0.01,value=1.4,pos=(275,300))
        self.K.SetFormat("%f")
        self.K.SetDigits(3)

        self.Kt = FS.FloatSpin(panel,-1,min_val=1,max_val=3,increment=0.01,value=1.3,pos=(275,350))
        self.Kt.SetFormat("%f")
        self.Kt.SetDigits(3)

        self.R = FS.FloatSpin(panel,-1,min_val=0,max_val=1,increment=0.01,value=0.287,pos=(275,400))
        self.R.SetFormat("%f")
        self.R.SetDigits(3)

        self.Rt = FS.FloatSpin(panel,-1,min_val=0,max_val=1,increment=0.01,value=0.287,pos=(285,450))
        self.Rt.SetFormat("%f")
        self.Rt.SetDigits(3)

        wx.StaticText(panel,-1,'Stagnation Temperature: ', (350,150))
        wx.StaticText(panel,-1,'Stagnation Pressure: ', (350,200))
        wx.StaticText(panel,-1,'Speed of Sound: ', (350,250))
        wx.StaticText(panel,-1,'Specific Heat Capacity of AIR @ Constant Pressure: ', (450,300))
        wx.StaticText(panel,-1,'Specific Heat Capacity of EXHAUST @ Constant Pressure: ', (450,350))

        self.t2 = wx.StaticText(panel,-1,'',(500,150))
        self.p2 = wx.StaticText(panel,-1,'',(500,200))
        self.speed = wx.StaticText(panel,-1,'',(500,250))
        self.cp = wx.StaticText(panel,-1,'',(710,300))
        self.cpe = wx.StaticText(panel,-1,'',(750,350))

        compute_btn = wx.Button(panel,1,'Calculate',(450,450))
        compute_btn.SetFocus()
        clear_btn = wx.Button(panel,2,'Quit',(650,450))

        wx.EVT_BUTTON(panel,1,self.OnCompute)
        wx.EVT_BUTTON(panel,2,self.OnClose)
        wx.EVT_CLOSE(panel,self.OnClose)
                      
    def OnCompute(self,event):

        t = float(self.temp.GetValue())
        p = float(self.pres.GetValue())
        M = float(self.mach.GetValue())
        k = float(self.K.GetValue())
        kt = float(self.Kt.GetValue())
        R = float(self.R.GetValue())
        Rt = float(self.Rt.GetValue())
        
        t2 = t*(1+((k-1)/2)*(M**2))
        p2 = p*((1+((k-1)/2)**(M**2))**((k-1)/k))
        v = (1000*k*R*t)**(0.5)
        cp = (k*R)/(k - 1)
        cpe = (kt*Rt)/(kt - 1)
        
        self.t2.SetLabel(str(t2) + '  K')
        self.p2.SetLabel(str(p2) + '  kPa')
        self.speed.SetLabel(str(v) + '  m/s')
        self.cp.SetLabel(str(cp) + '  KJ/kg.K')
        self.cpe.SetLabel(str(cpe) + '  KJ/kg.K')

        return t2,p2,v,k,kt,cp,cpe

    def OnClose(self,event):
        self.Destroy()

if __name__=='__main__':
    
    app = wx.PySimpleApp()
    frame = DesignConditions(parent=None, id=1)
    frame.Show()
    app.MainLoop()

FloatSpin is a widget that was downloaded online, basically a spinner that handles floats. On command i.e. when the calculate button is pressed variables are calculated i.e. t2,p2,v,k,kt,cp,cpe and displayed on the frame.

What I would like to do is import these calculated variables into another file to do further calculations... If some one can tell me how to this basic pass I would really appreciate it.

Thanks in Advance..

python

Edited 14 Years Ago by vegaseat because: added code tags

4 Contributors
7 Replies
106 Views
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Latest Post 14 Years Ago Latest Post by vegaseat

Namibnat 10 Junior Poster in Training

14 Years Ago

Put your code in code tags

vegaseat 1,735 DaniWeb's Hypocrite

14 Years Ago

I haven't been able to actually test this, but insert this at the bottom of __init__() ...

save_btn = wx.Button(panel,3,'Save Data',(750,450))
        wx.EVT_BUTTON(panel,3,self.OnSave)

    def OnSave(self,event):
        # 1 is a dummy for event
        t2, p2, v, k, kt, cp, cpe = self.OnCompute(1)
        fname = "MyData.dat"
        fout = open(fname, "w")
        # this will be the header
        s1 = "t2,p2,v,k,kt,cp,cpe" + '\n'
        # these are the data separated by commas
        sf = "%0.3f,%0.3f,%0.3f,%0.3f,%0.3f,%0.3f,%0.3f"
        s2 = sf % (t2, p2, v, k, kt, cp, cpe)
        fout.write(s1+s2)
        fout.close()

Look at file MyData.dat, use the second line which contains the data you want in the order the header shows. Split that line at the comma to get a list of data.

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GihanFernando 0 Newbie Poster · Answer 1 · 2009-12-14T06:40:32+00:00

I haven't been able to actually test this, but insert this at the bottom of __init__() ...
save_btn = wx.Button(panel,3,'Save Data',(750,450))
        wx.EVT_BUTTON(panel,3,self.OnSave)

    def OnSave(self,event):
        # 1 is a dummy for event
        t2, p2, v, k, kt, cp, cpe = self.OnCompute(1)
        fname = "MyData.dat"
        fout = open(fname, "w")
        # this will be the header
        s1 = "t2,p2,v,k,kt,cp,cpe" + '\n'
        # these are the data separated by commas
        sf = "%0.3f,%0.3f,%0.3f,%0.3f,%0.3f,%0.3f,%0.3f"
        s2 = sf % (t2, p2, v, k, kt, cp, cpe)
        fout.write(s1+s2)
        fout.close()
Look at file MyData.dat, use the second line which contains the data you want in the order the header shows. Split that line at the comma to get a list of data.

Firstly I really appreciate the extension its really helpful, but I what I meant was that I would like to export the data in another wxPython .py file for other calculations not just any old .dat file.

I was just wondering if you the code that would transfer the data
into another .py file. Cheers thanks a lot.

vegaseat 1,735 DaniWeb's Hypocrite Team Colleague · Answer 2 · 2009-12-15T00:09:34+00:00

This might just do it ...

def OnCompute(self,event):

        t = float(self.temp.GetValue())
        p = float(self.pres.GetValue())
        M = float(self.mach.GetValue())
        k = float(self.K.GetValue())
        kt = float(self.Kt.GetValue())
        R = float(self.R.GetValue())
        Rt = float(self.Rt.GetValue())

        # create module code string and save it
        # for import into another Python program
        sf = \
"""
t = %0.5f
p = %0.5f
M = %0.5f
k = %0.5f
kt = %0.5f
R = %0.5f
Rt = %0.5f
"""
        module_str = sf % (t, p, M, k, kt, R. Rt)
        fname = "raw_data.py"
        fout = open(fname, "w")
        fout.write(module_str)
        fout.close()

        t2 = t*(1+((k-1)/2)*(M**2))
        p2 = p*((1+((k-1)/2)**(M**2))**((k-1)/k))
        v = (1000*k*R*t)**(0.5)
        cp = (k*R)/(k - 1)
        cpe = (kt*Rt)/(kt - 1)
        
        self.t2.SetLabel(str(t2) + '  K')
        self.p2.SetLabel(str(p2) + '  kPa')
        self.speed.SetLabel(str(v) + '  m/s')
        self.cp.SetLabel(str(cp) + '  KJ/kg.K')
        self.cpe.SetLabel(str(cpe) + '  KJ/kg.K')

        return t2,p2,v,k,kt,cp,cpe

GihanFernando 0 Newbie Poster · Answer 3 · 2009-12-15T04:59:56+00:00

This might just do it ...

def OnCompute(self,event):

        t = float(self.temp.GetValue())
        p = float(self.pres.GetValue())
        M = float(self.mach.GetValue())
        k = float(self.K.GetValue())
        kt = float(self.Kt.GetValue())
        R = float(self.R.GetValue())
        Rt = float(self.Rt.GetValue())

        # create module code string and save it
        # for import into another Python program
        sf = \
"""
t = %0.5f
p = %0.5f
M = %0.5f
k = %0.5f
kt = %0.5f
R = %0.5f
Rt = %0.5f
"""
        module_str = sf % (t, p, M, k, kt, R. Rt)
        fname = "raw_data.py"
        fout = open(fname, "w")
        fout.write(module_str)
        fout.close()

        t2 = t*(1+((k-1)/2)*(M**2))
        p2 = p*((1+((k-1)/2)**(M**2))**((k-1)/k))
        v = (1000*k*R*t)**(0.5)
        cp = (k*R)/(k - 1)
        cpe = (kt*Rt)/(kt - 1)
        
        self.t2.SetLabel(str(t2) + '  K')
        self.p2.SetLabel(str(p2) + '  kPa')
        self.speed.SetLabel(str(v) + '  m/s')
        self.cp.SetLabel(str(cp) + '  KJ/kg.K')
        self.cpe.SetLabel(str(cpe) + '  KJ/kg.K')

        return t2,p2,v,k,kt,cp,cpe

I am really sorry to do this but, but this code basically prints out the calculated values in another .py file. What I want to do is pass the calculated variables between .py files i.e. i want to pass or parse t2,p2,v,k,kt,cp,cpe to another module featuring methods and functions and use the variables for further calculation...

lllllIllIlllI 178 Veteran Poster · Answer 4 · 2009-12-15T13:23:30+00:00

I take it the two modules are running at the same time?

I would just write the data to a file like vegaseat has shown you, and then in the other module i would load the data from the file. That is the easiest way you would be able to do it i think.

vegaseat 1,735 DaniWeb's Hypocrite Team Colleague · Answer 5 · 2009-12-28T07:53:27+00:00

I am really sorry to do this but, but this code basically prints out the calculated values in another .py file. What I want to do is pass the calculated variables between .py files i.e. i want to pass or parse t2,p2,v,k,kt,cp,cpe to another module featuring methods and functions and use the variables for further calculation...

I was hoping you could figure this out on your own, but here is a hint.

You import the module "raw_data.py" into your other program with
import raw_data
then access that data with ...
raw_data.t
raw_data.p
raw_data.M
... and so on.