简单的 Python 计算器（wxPython）

gistfile1.py

#!/usr/bin/env python
# -*- encoding: utf-8 -*-

import wx


def onclick(event):
	button = event.GetEventObject()
	label = button.GetLabel()
	nums = [str(i) for i in range(10)] + ['.', '+', '-', 'x', u'÷']
	
	# print repr(label)	
	if label in nums:
		xyz.AppendText(label)
	elif label == 'clear':
		xyz.SetValue('')

def resul(event):
	x = xyz.GetValue()
	x = x.replace('x', '*').replace(u'÷', '/')
	if '.' not in x:
		x = x + '.0'
	# print repr(x)
	if x:
		xyz.SetValue(str(eval(x, {"__builtins__": None}, {})))

if __name__ == '__main__':
	app = wx.App()
	win = wx.Frame(None, title='Simple BC', size=(325, 320))
	bkg = wx.Panel(win)

	xyz = wx.TextCtrl(bkg)
	result_button = wx.Button(bkg, label='=')

	hbox = wx.BoxSizer()
	hbox.Add(xyz, proportion=3, flag=wx.EXPAND)
	hbox.Add(result_button, proportion=1, flag=wx.EXPAND, border=5)

	
	xbox = wx.GridSizer(4,4,4,4)
	buttons = ['7', '8', '9', u'÷', '4', '5', '6', 'x', '1', '2',
			   '3', '-', '.', '0', 'clear', '+']

	for x in buttons:
		button = wx.Button(bkg, label=x)
 		xbox.Add(button, proportion=1, flag=wx.EXPAND, border=5)
		button.Bind(wx.EVT_BUTTON, onclick)

	vbox = wx.BoxSizer(wx.VERTICAL)
	vbox.Add(hbox, proportion=1, flag=wx.EXPAND|wx.ALL, border=5)
	vbox.Add(xbox, proportion=4, flag=wx.EXPAND|wx.ALL, border=5)
	bkg.SetSizer(vbox)
	
	result_button.Bind(wx.EVT_BUTTON, resul)

	win.Show()
	app.MainLoop()

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