modul netCDF4 does not work

netCDFVisualizer.ui

@@ -6,8 +6,8 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>771</width>
-    <height>835</height>
+    <width>389</width>
+    <height>518</height>
    </rect>
   </property>
   <property name="windowTitle">

netCDF_visualizer.py

@@ -135,22 +135,24 @@ class netCDFVisualizer:
     #when we click the plugin in QGIS the plugin will be loaded
     def initGui(self):
         """Create the menu entries and toolbar icons inside the QGIS GUI."""
-        icon_path = ':/plugins/netCDFVisualizer/icon.png'
+        icon_path = ':/plugins/netCDFVisualizer/adventure.png'
         self.add_action(
             icon_path,
             text=self.tr(u'netCDFVisualizer'),
             callback=self.callMask,
             parent=self.iface.mainWindow())
 
-        
-
-
     #when we close the plugin in QGIS the plugin will be unloaded
     def unload(self):
-        #we remove the menu item
-        self.iface.removePluginMenu('netCDFVisualizer', self.pluginButton)
-        #we remove the menu item
-        self.iface.removeToolBarIcon(self.pluginButton)   
+        """Removes the plugin menu item and icon from QGIS GUI."""	
+        for action in self.actions:
+            self.iface.removePluginMenu(
+                self.tr(u'&netCDFVisualizer'),
+                action)
+            self.iface.removeToolBarIcon(action)
+        else :
+            self.toolbar.removeAction(action)
+           
 
     #we create a function to call the mask       
     def callMask(self):

netCDF_visualizer_funtionality.py

@@ -34,7 +34,8 @@ import os
 #to import general tools from QGIS we need the qgis.core module
 from qgis.core import *
 #for loading the netCDF files we need the netCDF4 module
-
+import netCDF4 as nc
+from netCDF4 import Dataset
 #we create the path to the ui file
 #Path to the Ordner where the ui file is
 ncvPath = os.path.dirname(__file__) #the comand dirname gives the path to the directory where the file is
@@ -58,6 +59,8 @@ class maskAndFuntionality (BASE, WIDGET):
         """ Here is the place for the Clicked Signal"""
         self.btn_closePlugin.clicked.connect(self.closePlugin)
         self.btn_inputFile.clicked.connect(self.importData)
+        self.btn_remove.clicked.connect(self.removePath)
+        self.btn_load.clicked.connect(self.loadNetCDF)
 
 
     def closePlugin(self):
@@ -77,6 +80,20 @@ class maskAndFuntionality (BASE, WIDGET):
         #we remove the path from the text space
         self.text_set.clear()
 
+    def loadNetCDF(self):
+        """This function loads the netCDF file"""
+        #we get the path from the text space
+        path = self.text_set.text()
+        #we load the netCDF file
+        self.nc = Dataset(path, 'r', format='NETCDF4')
+        #we get the name of the variables
+        self.variables = self.nc.variables.keys()
+        #we set the name of the variables in the combo box  
+        self.txt_tab_dataSet.addItems(self.variables)
+        #we get the name of the dimensions
+        self.dimensions = self.nc.dimensions.keys()
+        #we set the name of the dimensions in the combo box
+        self.txt_tab_dataSet.addItems(self.dimensions)