grep from STDIN python

Hello everyone,
I have been trying to grep certain lines out of STDIN. Basically this is a little app that email is piped to. It works fine, the onlt thing is I get the whole email. I need only to strip out from and subject. Here is what I have so far
#!/usr/bin/python

import wx
import sys
import os
email = sys.stdin.read()
email_info = os.popen('grep -i \"^[subject:|from:]\" %s' %email)<--------------------------this is where i run into problems!
class EvoTray(wx.TaskBarIcon):
        def __init__(self, frame):
                wx.TaskBarIcon.__init__(self)

                self.frame = frame
                self.SetIcon(wx.Icon('/home/administrator/Desktop/env.png',wx.BITMAP_TYPE_PNG), 'EvoTray')
                self.Bind(wx.EVT_MENU, self.OnTaskBarActivate, id=1)
                self.Bind(wx.EVT_MENU, self.OnTaskBarDeactivate, id=2)
                self.Bind(wx.EVT_MENU, self.OnTaskBarClose, id=3)

        def CreatePopupMenu(self):
                menu = wx.Menu()
                menu.Append(1, 'Show')
                menu.Append(2, 'Hide')
                menu.Append(3, 'Close')
                return menu

        def OnTaskBarClose(self, event):
                self.frame.Close()

        def OnTaskBarActivate(self, event):
                if not self.frame.IsShown():
                        self.frame.Show()

        def OnTaskBarDeactivate(self, event):
                if self.frame.IsShown():
                        self.frame.Hide()

class MyFrame(wx.Frame):
        def __init__(self, parent, id, title):
                wx.Frame.__init__(self, parent, id, title, (-1, -1),
(290, 280))
                self.txt_ctrl = wx.TextCtrl(self,-1,email_info,style=wx.TE_MULTILINE|wx.TE_BESTWRAP)
                self.tskic = EvoTray(self)
                self.Centre()
                self.Bind(wx.EVT_CLOSE, self.OnClose)

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

class MyApp(wx.App):
        def OnInit(self):
                frame = MyFrame(None, -1, 'EvoMailNotification')
                frame.Show(True)
                self.SetTopWindow(frame)
                return True

app = MyApp(0)
app.MainLoop()


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