//! [0]
encodedString = QByteArray("...")
codec = QTextCodec::codecForName("KOI8-R")
string = codec->toUnicode(encodedString)
//! [0]


//! [1]
string = QString("...")
codec = QTextCodec::codecForName("KOI8-R")
encodedString = codec->fromUnicode(string)
//! [1]


//! [2]
codec = QTextCodec::codecForName("Shift-JIS")
decoder = codec->makeDecoder()

string = QString()
while new_data_available():
    chunk = get_new_data();
    string += decoder->toUnicode(chunk)

//! [2]


//! [3]
def main():
    app = QApplication([])
    QTextCodec::setCodecForTr(QTextCodec::codecForName("eucKR"))
    ...
//! [3]