# -*- coding:utf-8 -*-
import sys
from PyQt4.QtGui import *
from PyQt4.QtCore import *
class TextConvert(QWidget):
    def __init__(self,parent=None):
        QWidget.__init__(self,parent)
        self.fname = ''
        self.plain = QPlainTextEdit()
        self.plain.setLineWrapMode(0)
        self.lbl = QLabel('<b>'+u'Кодировка:'+'</b>')
        self.box = QComboBox()
        self.btnLoad = QPushButton(u'Открыть')
        self.btnSave = QPushButton(u'Сохранить')
        grid = QGridLayout(self)
        grid.setMargin(1)
        grid.addWidget(self.plain,0,0,10,10)
        grid.addWidget(self.lbl,10,0,1,1)
        grid.addWidget(self.box,10,1,1,3)
        grid.addWidget(self.btnLoad,10,8,1,1)
        grid.addWidget(self.btnSave,10,9,1,1)
        self.load_codecs()
        self.box.currentIndexChanged.connect(self.on_index)
        self.btnLoad.clicked.connect(self.on_load)
        self.btnSave.clicked.connect(self.on_save)
    
    def load_codecs(self):
        lst =['System','UTF-8','cp1251','cp866','KOI8-R']
        self.box.addItems(lst)
        
    def on_index(self):
        self.open_file()
        
    def on_load(self):
        tmp = QFileDialog.getOpenFileName(self,"Load", self.fname,"*.*")
        if not tmp: return
        self.fname = tmp
        self.open_file()
        
    def open_file(self):
        if not self.fname: return
        f = QFile(self.fname)
        if not f.open(QIODevice.ReadOnly): return
        s = QTextStream(f)
        s.setCodec(self.box.currentText().toLocal8Bit())
        self.plain.setPlainText(s.readAll())
        f.close()
        
    def on_save(self):
        tmp = QFileDialog.getSaveFileName(self,"Save", self.fname,"*.*")
        if not tmp: return
        self.fname = tmp
        f = QFile(self.fname)
        if not f.open(QIODevice.WriteOnly): return
        f.write(self.plain.toPlainText().toLocal8Bit())
        f.close()        
if __name__=="__main__":
    app = QApplication([])
    w = TextConvert()
    w.setFont(QFont('times',14))
    w.move(0,0)
    w.resize(800,600)
    w.show()
    sys.exit(app.exec_())

     def open_file(self):
        if not self.fname: return
        f = QFile(self.fname)
        if not f.open(QIODevice.ReadOnly): return
        s = QTextStream(f)
        s.setCodec(self.box.currentText().toLocal8Bit())
        txt = s.readAll()
        f.close()
        txt.replace(QRegExp("[^\w\r\n]")," ")
        self.plain.setPlainText(txt)

 li =re.findall("[A-Za-z0-9 А-Яа-я]+".data)
" ".join(li)