WXPYTHON - CALCULATOR

 

import wx

class Interface(wx.Frame):

    def __init__(self, parent, title):

        super(Interface, self).__init__(parent, title=title, size=(300, 400))

        # Show the window on screen

        self.setup()

        self.Show()

    def setup(self):

        box = wx.BoxSizer(wx.VERTICAL)

        self.textbox = wx.TextCtrl(self, style=wx.TE_RIGHT)

        box.Add(self.textbox, flag=wx.EXPAND | wx.TOP | wx.BOTTOM, border=4)

        grid = wx.GridSizer(5, 4, 10, 10)

        buttons = [

            '7', '8', '9', '/',

            '4', '5', '6', '*',

            '1', '2', '3', '-',

            '0', '.', 'C', '+',

            '='

        ]

        for label in buttons:

            button = wx.Button(self, -1, label)

            grid.Add(button, 0, wx.EXPAND)

            self.Bind(wx.EVT_BUTTON, self.on_button_press, button)

        box.Add(grid, proportion=1, flag=wx.EXPAND)

        self.SetSizer(box)

    def on_button_press(self, e):

        # Get label of button

        label = e.GetEventObject().GetLabel()

        # Get the input from the TextCtrl

        calculation = self.textbox.GetValue()

        # Handle the event based on the button pressed

        if label == '=':  # Calculate the result of the input in the TextCtrl

            # Ignore an empty calculation

            if not calculation:

                return

            try:

                # Calculate the result

                result = eval(calculation)

            except SyntaxError as err:  # Catch any input errors (e.g. '6 +* 2')

                wx.LogError('Invalid syntax ({}). Please check your input and try again.'.format(calculation))

                return

            except NameError as err:  # Catch any manually typed errors (e.g. '2 x three')

                wx.LogError('There was a error. Please check your input and try again.')

                return

            # Show the result

            self.textbox.SetValue(str(result))

        elif label == 'C':  # Clear the TextCtrl

            self.textbox.SetValue('')

        else:  # 0-9 (and .)

            # Add the label of the button press to the current calculation in the TextCtrl

            self.textbox.SetValue(calculation + label)

if __name__ == '__main__':

    # Create the application object

    app = wx.App()

    Interface(None, title='Calculator')

    app.MainLoop()