simple GUI calculator with wxpython

here was an wxpython calculator taht i've copied from http://pythonwise.blogspot.com/2006/05/wxpython-calculator-in-50-lines-of.html , and written by Miki Tebeka

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from __future__ import division __author__ = "Miki Tebeka " __version__ = "0.0.2" # Calculator GUI: # ___________v # [7][8][9][/] # [4][5][6][*] # [1][2][3][-] # [0][.][C][+] # [ = ] import wx # So we can evaluate "sqrt(8)" from math import * class Calculator(wx.Dialog): '''Main calculator dialog''' def __init__(self): title = "Calculator version %s" % __version__ wx.Dialog.__init__(self, None, -1, title) sizer = wx.BoxSizer(wx.VERTICAL) # Main vertical sizer # ____________v self.display = wx.ComboBox(self, -1) # Current calculation sizer.Add(self.display, 0, wx.EXPAND) # Add to main sizer # [7][8][9][/] # [4][5][6][*] # [1][2][3][-] # [0][.][C][+] gsizer = wx.GridSizer(4, 4) for row in (("7", "8", "9", "/"), ("4", "5", "6", "*"), ("1", "2", "3", "-"), ("0", ".", "C", "+")): for label in row: b = wx.Button(self, -1, label) gsizer.Add(b) self.Bind(wx.EVT_BUTTON, self.OnButton, b) sizer.Add(gsizer, 1, wx.EXPAND) # [ = ] b = wx.Button(self, -1, "=") self.Bind(wx.EVT_BUTTON, self.OnButton, b) sizer.Add(b, 0, wx.EXPAND) self.equal = b # Set sizer and center self.SetSizer(sizer) sizer.Fit(self) self.CenterOnScreen() def OnButton(self, evt): '''Handle button click event''' # Get title of clicked button label = evt.GetEventObject().GetLabel() if label == "=": # Calculate try: compute = self.display.GetValue() # Ignore empty calculation if not compute.strip(): return # Calculate result result = eval(compute) # Add to history self.display.Insert(compute, 0) # Show result self.display.SetValue(str(result)) except Exception, e: wx.LogError(str(e)) return elif label == "C": # Clear self.display.SetValue("") else: # Just add button text to current calculation self.display.SetValue(self.display.GetValue() + label) self.equal.SetFocus() # Set the [=] button in focus if __name__ == "__main__": # Run the application app = wx.PySimpleApp() dlg = Calculator() dlg.ShowModal() dlg.Destroy()