from PySide import QtGui, QtCore
import sys


class User():
    def __init__(self, name, password):
        self.name = name
        self.password = password


class MyTableModel(QtCore.QAbstractTableModel):

    def __init__(self, parent, rows, columns):
        super().__init__(parent)
        self.rows = rows
        self.columns = columns

    def columnCount(self, index):
        return len(self.columns)

    def rowCount(self, index):
        return len(self.rows)

    def data(self, index, role):
        if index.isValid():
            if (role == QtCore.Qt.DisplayRole) or (role == QtCore.Qt.EditRole):
                attr_name = self.columns[index.column()]
                row = self.rows[index.row()]
                return getattr(row, attr_name)

    def flags(self, index):
        if not index.isValid():
            return QtCore.Qt.ItemIsEnabled
        else:
            return QtCore.Qt.ItemIsEnabled | QtCore.Qt.ItemIsSelectable | QtCore.Qt.ItemIsEditable

    def setData(self, index, value, role=QtCore.Qt.EditRole):
        if index.isValid() and role == QtCore.Qt.EditRole:
            attr_name = self.columns[index.column()]
            row = self.rows[index.row()]
            setattr(row, attr_name, value)


class MyWindow(QtGui.QWidget):
    def __init__(self):
        super(MyWindow, self).__init__()
        self.setLayout(QtGui.QFormLayout(self))
        self.user_edit = QtGui.QLineEdit(self)
        self.password_edit = QtGui.QLineEdit(self)
        self.mapper = QtGui.QDataWidgetMapper(self)

	user1 = User('Mary', '12345')
	user2 = User('John', 'qwerty')

	rows = [user1, user2]
	columns = ['name', 'password']

        self.model = MyTableModel(self, rows, columns)
        self.mapper.setModel(self.model)
        self.mapper.addMapping(self.user_edit, 0)
        self.mapper.addMapping(self.password_edit, 1)
        self.mapper.toFirst()

        self.layout().addRow("User name:", self.user_edit)
        self.layout().addRow("Password:", self.password_edit)

        self.btnPrevious = QtGui.QPushButton("Previous", self)
        self.btnNext = QtGui.QPushButton("Next",self)
        self.layout().addWidget(self.btnPrevious)
        self.layout().addWidget(self.btnNext)

        self.btnPrevious.clicked.connect(self.mapper.toPrevious)
        self.btnNext.clicked.connect(self.mapper.toNext)

if __name__ == "__main__":
    app = QtGui.QApplication(sys.argv)
    win = MyWindow()
    win.show()
    app.exec_()