I lost characters at read

[Eduardo Ferro]

Hi!

I am trying to create a window to log the contents of a file, to do this
i first read all the file and later i periodically read the file if it
grow up

The problem is that when my periodic callback read from file i lost one
or two characters per line and I don`t  understand why
Me code is (the problem is at the checkFichero fuction):

class LogWindow:
	'''Clase para mostrar a modo de log lo leido de un fichero de texto'''

	def __init__(self,gtkContainer,fich,maxLineas):
		self.maxLineas = maxLineas
		self.numLineas = 0
		self.intervalo = 1000
		self.fich = fich
		self.gtkScrolledWindow = GtkScrolledWindow()
		gtkContainer.add(self.gtkScrolledWindow)
		self.gtkText = GtkText()
		self.gtkScrolledWindow.add_with_viewport(self.gtkText)
		self.gtkScrolledWindow.set_policy(POLICY_AUTOMATIC, POLICY_AUTOMATIC)
		
		self.gtkScrolledWindow.show_all()
		self.lstLineas = []
		self.timer = timeout_add(self.intervalo,self.checkFichero)

	def checkFichero(self):
		self.gtkText.freeze()
		linea = self.fich.read()
		while linea != '':
			print '"%s"', % linea
			self.lstLineas.append(linea)
			self.gtkText.insert_defaults(linea)
			linea = self.fich.read()

		self.gtkText.thaw()
		print 'checkFichero'
		return 'true'
		

#-------------------------------------
def main():
	gtkWindowMain = GtkWindow(type='toplevel')
	gtkWindowMain.connect('destroy',mainquit)
	fich = open('menu.txt','r')
	logWin = LogWindow(gtkWindowMain,fich,50)
	gtkWindowMain.show_all()
	mainloop()
#-------------------------------------

if __name__ == '__main__':
	main()