Index: wflow-py/wflow/pcrglobwb/ncConverter.py
===================================================================
diff -u -rbec706d676b364d4a89a4e7141382db4511fa485 -r1738c121cfc83b76d915b8ed55747cb1bb9a2f64
--- wflow-py/wflow/pcrglobwb/ncConverter.py	(.../ncConverter.py)	(revision bec706d676b364d4a89a4e7141382db4511fa485)
+++ wflow-py/wflow/pcrglobwb/ncConverter.py	(.../ncConverter.py)	(revision 1738c121cfc83b76d915b8ed55747cb1bb9a2f64)
@@ -32,7 +32,7 @@
 import netCDF4 as nc
 import numpy as np
 import pcraster as pcr
-import virtualOS as vos
+from . import virtualOS as vos
 
 # TODO: defined the dictionary (e.g. filecache = dict()) to avoid open and closing files
 
@@ -50,7 +50,7 @@
         
         # Let users decide what their preference regarding latitude order. 
         self.netcdf_y_orientation_follow_cf_convention = False
-        if 'netcdf_y_orientation_follow_cf_convention' in iniItems.reportingOptions.keys() and\
+        if 'netcdf_y_orientation_follow_cf_convention' in list(iniItems.reportingOptions.keys()) and\
             iniItems.reportingOptions['netcdf_y_orientation_follow_cf_convention'] == "True":
             msg = "Latitude (y) orientation for output netcdf files start from the bottom to top."
             self.netcdf_y_orientation_follow_cf_convention = True
@@ -62,15 +62,15 @@
         # netcdf format and zlib setup 
         self.format = 'NETCDF3_CLASSIC'
         self.zlib = False
-        if "formatNetCDF" in iniItems.reportingOptions.keys():
+        if "formatNetCDF" in list(iniItems.reportingOptions.keys()):
             self.format = str(iniItems.reportingOptions['formatNetCDF'])
-        if "zlib" in iniItems.reportingOptions.keys():
+        if "zlib" in list(iniItems.reportingOptions.keys()):
             if iniItems.reportingOptions['zlib'] == "True": self.zlib = True
         
 
         # if given in the ini file, use the netcdf as given in the section 'specific_attributes_for_netcdf_output_files'
         if 'specific_attributes_for_netcdf_output_files' in iniItems.allSections:
-            for key in iniItems.specific_attributes_for_netcdf_output_files.keys():
+            for key in list(iniItems.specific_attributes_for_netcdf_output_files.keys()):
 
                 self.attributeDictionary[key] = iniItems.specific_attributes_for_netcdf_output_files[key]
                 
@@ -136,7 +136,7 @@
         var.units = varUnits
 
         attributeDictionary = self.attributeDictionary
-        for k, v in attributeDictionary.items(): setattr(rootgrp,k,v)
+        for k, v in list(attributeDictionary.items()): setattr(rootgrp,k,v)
 
         rootgrp.sync()
         rootgrp.close()
@@ -145,7 +145,7 @@
 
         rootgrp = nc.Dataset(ncFileName,'a')
 
-        for k, v in attributeDictionary.items(): setattr(rootgrp,k,v)
+        for k, v in list(attributeDictionary.items()): setattr(rootgrp,k,v)
 
         rootgrp.sync()
         rootgrp.close()