* project.py: Added comments.

system/project.py

@@ -1,4 +1,3 @@
-#import logger 
 import dataset
 
 class Project:
@@ -11,39 +10,45 @@ class Project:
         self.datasets=[]
         
     def attach(self, observer):
+        """Attach observer for selection updates"""
         if not observer in self._selection_observers:
             self._selection_observers.append(observer)
 
     def detach(self, observer):
-       try:
+        """Detach observer for selection updates"""
-           self.selection_observers.remove(observer)
+        try:
-       except ValueError:
+            self.selection_observers.remove(observer)
-           pass
+        except ValueError:
+            pass
 
     def notify(self, modifier=None):
+        """Notifies observers that selection is updated"""
         for observer in self.selection_observers:
             if modifier != observer:
                 observer.update(self)
 
     def set_selection(self,dim_name,selection):
+        """Sets selection and notifies observers"""
         current_selection = set(selection)
         self.current_selection[dim_name] = current_selection
         self.notify()
 
     def get_selection(self,sel_obj):
+        """Returns the current selection object"""
         return sel_obj.current_selection
-
     
     def add_dataset(self,dataset):
+        """Appends a new Dataset to the project."""
         self.datasets.append(dataset)
         for dim_name in dataset.ids.keys():
             if dim_name not in self.dim_names:
                 self.dim_names.append(dim_name)
 
     def suggest_dim_name(self,dim_name):
+        """Creates an arbitrary unique name for a new dimension."""
         if dim_name in self.dim_names:
             dim_name = dim_name + "_t" 
         return dim_name
         
-            
+# FIXME: Singleton project should be removed.            
 c_p = Project()