diff --git a/library/cadbiom/models/guard_transitions/translators/chart_xml_pid.py b/library/cadbiom/models/guard_transitions/translators/chart_xml_pid.py
index f077322034002a39e2aa8b539b35f42df684c8f0..e29c34ed064f800ae65aac00c3d1e9463ffe44a9 100644
--- a/library/cadbiom/models/guard_transitions/translators/chart_xml_pid.py
+++ b/library/cadbiom/models/guard_transitions/translators/chart_xml_pid.py
@@ -41,9 +41,11 @@
 """
 Guarded transition interpretation of PID data
 """
+from __future__ import print_function
+from lxml import etree
 
 from cadbiom.models.guard_transitions.chart_model import ChartModel, ChartModelException
-from lxml import etree
+
 
 class MEvent(object):
     """
@@ -177,13 +179,13 @@ class PidXmlParser:
         self.location_dict = dict()
         self.make_dict()                    # build dict_id and dict_name
         dict_mev = self.make_mev_dict()     # build a temporary dictionary
-        print "\n\n\nNB INTERACTIONS: "+str(self.int_cpt)
-        print "\n\n\nNB MOLECULES: "+str(self.mol_cpt)
+        print("\n\n\nNB INTERACTIONS:", self.int_cpt)
+        print("\n\n\nNB MOLECULES:", self.mol_cpt)
         cpt = 0
         for key in self.location_dict.keys() :
             cpt += self.location_dict[key]
-            print key,'\t',self.location_dict[key]
-        print cpt
+            print(key,'\t', self.location_dict[key])
+        print(cpt)
 #        for k in dict_mev.keys():
 #            print dict_mev[k]
         for kmev in dict_mev:
@@ -248,7 +250,7 @@ class PidXmlParser:
         """
         id_list = []
         int_list = self.page.find('Model/InteractionList')
-        print len(int_list)
+        print(len(int_list))
         mev_dict = dict()
         for inter in int_list:
             source = inter.find('Source')
@@ -546,7 +548,7 @@ class PidXmlParser:
                 elif node_type == 'trap':
                     node = self.top.add_trap_node(xloc, yloc, name)
                 else :
-                    print 'node type error'
+                    print('node type error')
                 self.node_count += 1
                 self.dict_node[node_name] = node
                 self.coord_inc()