def replace(self, text, pattern=None):
        """Replace selected text by *text*
        If *pattern* is not None, replacing selected text using regular
        expression text substitution"""
        cursor = self.textCursor()
        cursor.beginEditBlock()
        if pattern is not None:
            seltxt = to_text_string(cursor.selectedText())
        cursor.removeSelectedText()
        if pattern is not None:
            text = re.sub(to_text_string(pattern),
                          to_text_string(text), to_text_string(seltxt))
        cursor.insertText(text)
        cursor.endEditBlock()
def replace ( self , text , pattern = None ) : cursor = self . textCursor ( ) cursor . beginEditBlock ( ) if pattern is not None : seltxt = to_text_string ( cursor . selectedText ( ) ) cursor . removeSelectedText ( ) if pattern is not None : text = re . sub ( to_text_string ( pattern ) , to_text_string ( text ) , to_text_string ( seltxt ) ) cursor . insertText ( text ) cursor . endEditBlock ( )
Replace selected text by *text*
        If *pattern* is not None, replacing selected text using regular
        expression text substitution