python - wxPython: Using a GridBagSizer -

i beginner development in python, , i'm trying create simple application.

this application supposed show me frame containing gridbagsize should load , position 4 buttons. however, small problem encounter 4 buttons found small in upper left of screen.

just clarify, i'm using python 2.7.8 windows 32-bit , wxpython 2.8.12.1.

i attaching code below:

#!/usr/bin/python # -*- coding: utf-8 -*- # import wx module import wx # creating class derived wx.frame class myframe(wx.frame):     def __init__(self, title):         super(myframe, self).__init__(parent=none, id=wx.id_any, title=title,style=wx.default_frame_style|wx.tab_traversal)         # creating gridbagsizer         framesizer=wx.gridbagsizer(vgap=5, hgap=5)         # creating buttons inside frame , positioning them in gridbagsizer         button1=wx.button(parent=self, id=wx.id_any, label="button 1")         framesizer.add(item=button1, pos=(0, 0), span=(2, 1), flag=wx.align_centre)         button2=wx.button(parent=self, id=wx.id_any, label="button 2")         framesizer.add(item=button2, pos=(0, 1), span=(2, 1), flag=wx.align_centre)         button3=wx.button(parent=self, id=wx.id_any, label="button 3")         button4=wx.button(parent=self, id=wx.id_close, label="button 4")         self.setsizer(framesizer)         #framesizer.setsizehints(self)         # set our frame dimansions         self.setsize((400, 250))         # event of buttons ((only closing event button4)         button4.bind(wx.evt_button, self.onclose)     # creating class method associated action of button4     def onclose(self, evt):         self.destroy() class myapp(wx.app):     """     specific class application created     """     def oninit(self):         frame=myframe("example of small program")         # display frame         frame.show(true)         # put frame in main window         self.settopwindow(frame)         return true     # method of closing     def onexit(self):         result=wx.messagedialog(parent=none, message="goodbye", caption="exit", style=wx.ok)         # display dialog goodbye         result.showmodal() # program execution app=myapp(redirect=false) app.mainloop() 

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thank quick response.

yes, forgot add buttons 3 , 4 in framesizer.

i put insertion buttons code below.

at display, still have buttons reduced in upper left of screen.

about suggestion reduct span 1 row , 1 col, have same result.

i think have use addgrowablecol , addgrowablerow methods not know use them.

with gridsizer sizer, frame automatically resized.

apparently not case gridbagsizer?

thanks help.

best regards.

        # creating buttons inside frame , positioning them in gridbagsizer         button1=wx.button(parent=self, id=wx.id_any, label="button 1")         framesizer.add(item=button1, pos=(0, 0), span=(2, 1), flag=wx.align_centre)         button2=wx.button(parent=self, id=wx.id_any, label="button 2")         framesizer.add(item=button2, pos=(0, 1), span=(2, 1), flag=wx.align_centre)         button3=wx.button(parent=self, id=wx.id_any, label="button 3")         framesizer.add(item=button3, pos=(2, 0), span=(2, 1), flag=wx.align_centre)         button4=wx.button(parent=self, id=wx.id_close, label="button 4")         framesizer.add(item=button4, pos=(2, 1), span=(2, 1), flag=wx.align_centre)         self.setsizer(framesizer) 

first, wanted thank you have given me on understanding of gridbagsizer.

i found solution problem.

in fact, used addgrowablerow , addgrowablecol methods.

i reaffixable entire code hereunder,hoping beginner me.

if find error in code, let me know.

best regards.

#!/usr/bin/python # -*- coding: utf-8 -*- # import wx module import wx # creating class derived wx.frame class myframe(wx.frame):     def __init__(self, title):         super(myframe, self).__init__(parent=none, id=wx.id_any, title=title,style=wx.default_frame_style|wx.tab_traversal)         # creating gridbagsizer         framesizer=wx.gridbagsizer(vgap=5, hgap=5)         # creating buttons inside frame , positioning them in gridbagsizer         button1=wx.button(parent=self, id=wx.id_any, label="button 1")         framesizer.add(item=button1, pos=(0, 0), span=(2, 1), flag=wx.align_centre)         button2=wx.button(parent=self, id=wx.id_any, label="button 2")         framesizer.add(item=button2, pos=(0, 1), span=(2, 1), flag=wx.align_centre)         button3=wx.button(parent=self, id=wx.id_any, label="button 3")         framesizer.add(item=button3, pos=(2, 0), span=(2, 1), flag=wx.align_centre)         button4=wx.button(parent=self, id=wx.id_close, label="button 4")         framesizer.add(item=button4, pos=(2, 1), span=(2, 1), flag=wx.align_centre)         self.setsizer(framesizer)         framesizer.setsizehints(self)         # resize our columns method addgrowablecol         in range(2):             framesizer.addgrowablecol(i)         # resize our rows method addgrowablerow         in range(4):             framesizer.addgrowablerow(i)         # set our frame dimansions         self.setsize((400, 250))         # event of buttons ((only closing event button4)         button4.bind(wx.evt_button, self.onclose)     # creating class method associated action of button4     def onclose(self, evt):         self.destroy() class myapp(wx.app):     """     specific class application created     """     def oninit(self):         frame=myframe("example of small program")         # display frame         frame.show(true)         # put frame in main window         self.settopwindow(frame)         return true     # method of closing     def onexit(self):         result=wx.messagedialog(parent=none, message="goodbye", caption="exit", style=wx.ok)         # display dialog goodbye         result.showmodal() # program execution app=myapp(redirect=false) app.mainloop()