PySide: Updating pandas Dataframe imports

[barbarossa]

In my program I try to show different .csv/.txt files with the help of pandas module. The problem that I have is that only the first import is shown, while all further imports are not shown (the first import remains) ... although the data is read from the file.

In example, I try to first upload the first .csv file:
@1.0 2.0 3.0 a
4.0 5.0 6.0 b@

which is shown and then I import the other .csv file:
@a b c d e f g h
1 2 3 4 5 6 7 8
q w e r t y u i@

but is not shown.

I would be happy of any suggestion why this is not working.

@from PySide import QtGui
from PySide import QtCore
import pandas as pd
QVariant = lambda value=None: value

class IdentificationWidget(QtGui.QWidget):
def init(self, data):
super().init()

    self.data = data
    self.dataModel = DataFrameModel()
    self.dataTable = QtGui.QTableView()

def update(self):
    print("update is being made")
    self.dataModel.signalUpdate(self.data)
    self.dataModel.printShape()
    self.dataTable.setModel(self.dataModel)
    self.main_layout = QtGui.QVBoxLayout()
    self.main_layout.addWidget(self.dataTable)
    self.setLayout(self.main_layout)

class DataFrameModel(QtCore.QAbstractTableModel):
''' data model for a DataFrame class '''
def init(self):
super(DataFrameModel, self).init()
self.df = pd.DataFrame()

def setDataFrame(self, dataFrame):
    self.df = dataFrame

def signalUpdate(self, dataIn):
    self.df = dataIn
    self.layoutChanged.emit()

def printShape(self):
    print(self.df.shape[0], self.df.shape[1])
#------------- table display functions -----------------
def headerData(self, section, orientation, role=QtCore.Qt.DisplayRole):
    if role != QtCore.Qt.DisplayRole:
        return QVariant()

    if orientation == QtCore.Qt.Horizontal:
        try:
            return self.df.columns.tolist()[section]
        except (IndexError, ):
            return QVariant()
    elif orientation == QtCore.Qt.Vertical:
        try:
            # return self.df.index.tolist()
            return self.df.index.tolist()[section]
        except (IndexError, ):
            return QVariant()

def data(self, index, role=QtCore.Qt.DisplayRole):
    if role != QtCore.Qt.DisplayRole:
        return QVariant()

    if not index.isValid():
        return QVariant()

    return QVariant(str(self.df.ix[index.row(), index.column()]))

def flags(self, index):
        flags = super(DataFrameModel, self).flags(index)
        flags |= QtCore.Qt.ItemIsEditable
        return flags

def setData(self, index, value, role):
    row = self.df.index[index.row()]
    col = self.df.columns[index.column()]

    dtype = self.df[col].dtype
    if dtype != object:
        value = None if value == '' else dtype.type(value)
    self.df.set_value(row, col, value)
    return True

def rowCount(self, index=QtCore.QModelIndex()):
    return self.df.shape[0]

def columnCount(self, index=QtCore.QModelIndex()):
    return self.df.shape[1]

class MainWindow(QtGui.QMainWindow):
"""Main window of the application."""
def init(self):
super(MainWindow, self).init()
self.main_widget = QtGui.QWidget(self)

    # -- Stacked widget is used to -- stack widgets.
    self.stacked_widget = QtGui.QStackedWidget()

    # -- Menu bar.
    self.init_menu_bar()

    # -- Layout is put together
    grid = QtGui.QGridLayout()
    grid.addWidget(self.stacked_widget, 0, 0)

    self.main_widget.setLayout(grid)

    self.setCentralWidget(self.main_widget)
    self.setGeometry(50, 50, 800, 600)

def init_menu_bar(self):
    """Initialize menu bar."""
    menu_bar = self.menuBar()
    file_menu = menu_bar.addMenu('&File')

    # .. Add uff import option.
    import_action = QtGui.QAction('&Open/Import', self)
    import_action.setShortcut('Ctrl+O')
    import_action.setStatusTip('Open file ...')
    file_menu.addAction(import_action)
    import_action.triggered.connect(self.getFiles)

def getFiles(self):
    file_name, filtr = QtGui.QFileDialog.getOpenFileName(
        self, self.tr("Open File"), "/.", self.tr("(*.csv *.txt);;"))
    self.data = pd.read_csv(file_name, sep=' ')
    # -- Update all widgets.

    widgets = {0: IdentificationWidget}
    widget = widgets[0](self.data)
    widget.update()  # widget update

    self.stacked_widget.addWidget(widget)

if name == 'main':
import sys
app = QtGui.QApplication(sys.argv)

main_window = MainWindow()
main_window.show()

sys.exit(app.exec_())@