diff --git a/src/Mod/Arch/ArchComponent.py b/src/Mod/Arch/ArchComponent.py
index 9eecc618f..8359a9a4d 100644
--- a/src/Mod/Arch/ArchComponent.py
+++ b/src/Mod/Arch/ArchComponent.py
@@ -633,7 +633,7 @@ class Component:
                     except Part.OCCError:
                         # error in computing the areas. Better set them to zero than show a wrong value
                         if obj.HorizontalArea.Value != 0:
-                            print "Debug: Error computing areas for ",obj.Label,": unable to project face: ",str([v.Point for v in f.Vertexes])," (face normal:",f.normalAt(0,0),")"
+                            print("Debug: Error computing areas for ",obj.Label,": unable to project face: ",str([v.Point for v in f.Vertexes])," (face normal:",f.normalAt(0,0),")")
                             obj.HorizontalArea = 0
                         if hasattr(obj,"PerimeterLength"):
                             if obj.PerimeterLength.Value != 0:
diff --git a/src/Mod/Arch/ArchRoof.py b/src/Mod/Arch/ArchRoof.py
index b79825e17..195023c87 100644
--- a/src/Mod/Arch/ArchRoof.py
+++ b/src/Mod/Arch/ArchRoof.py
@@ -647,10 +647,10 @@ class _Roof(ArchComponent.Component):
                                         rn += 1
             if obj.RidgeLength.Value != rl:
                 obj.RidgeLength = rl
-                print str(rn)+" ridge edges in roof "+obj.Name
+                print(str(rn)+" ridge edges in roof "+obj.Name)
             if obj.BorderLength.Value != bl:
                 obj.BorderLength = bl
-                print str(bn)+" border edges in roof "+obj.Name
+                print(str(bn)+" border edges in roof "+obj.Name)
         ArchComponent.Component.computeAreas(self,obj)
 
 
diff --git a/src/Mod/Arch/ArchSchedule.py b/src/Mod/Arch/ArchSchedule.py
index 88e527310..ba4c16598 100644
--- a/src/Mod/Arch/ArchSchedule.py
+++ b/src/Mod/Arch/ArchSchedule.py
@@ -112,8 +112,8 @@ class _ArchSchedule:
             obj.Result.set("A"+str(i+2),obj.Description[i].encode("utf8"))
             if verbose:
                 l= "OPERATION: "+obj.Description[i]
-                print l
-                print len(l)*"="
+                print (l)
+                print (len(l)*"=")
             # get list of objects
             objs = obj.Objects[i]
             val = obj.Value[i]
@@ -172,7 +172,7 @@ class _ArchSchedule:
                 if val.upper() == "COUNT":
                     val = len(objs)
                     if verbose:
-                        print val, ",".join([o.Label for o in objs])
+                        print (val, ",".join([o.Label for o in objs]))
                     obj.Result.set("B"+str(i+2),str(val))
                 else:
                     vals = val.split(".")
@@ -180,13 +180,13 @@ class _ArchSchedule:
                     for o in objs:
                         if verbose:
                             l = o.Name+" ("+o.Label+"):"
-                            print l+(40-len(l))*" ",
+                            print (l+(40-len(l))*" ",)
                         try:
                             d = o
                             for v in vals[1:]:
                                 d = getattr(d,v)
                             if verbose:
-                                print d
+                                print (d)
                             if hasattr(d,"Value"):
                                 d = d.Value
                         except:
@@ -216,7 +216,7 @@ class _ArchSchedule:
                     else:
                         obj.Result.set("B"+str(i+2),str(val))
                     if verbose:
-                        print "TOTAL:"+34*" "+str(val)
+                        print ("TOTAL:"+34*" "+str(val))
 
     def __getstate__(self):
         return self.Type
diff --git a/src/Mod/Arch/importIFC.py b/src/Mod/Arch/importIFC.py
index 53a007657..14fa677d3 100644
--- a/src/Mod/Arch/importIFC.py
+++ b/src/Mod/Arch/importIFC.py
@@ -35,7 +35,7 @@ import os,time,tempfile,uuid,FreeCAD,Part,Draft,Arch,math,DraftVecUtils
 
 DEBUG = False
 
-if open.__module__ == '__builtin__':
+if open.__module__ in ['__builtin__','io']:
     pyopen = open # because we'll redefine open below
 
 # which IFC type must create which FreeCAD type
diff --git a/src/Mod/Arch/importIFClegacy.py b/src/Mod/Arch/importIFClegacy.py
index b55c9c478..4ccbf3f3b 100644
--- a/src/Mod/Arch/importIFClegacy.py
+++ b/src/Mod/Arch/importIFClegacy.py
@@ -56,7 +56,7 @@ supportedIfcTypes = ["IfcSite", "IfcBuilding", "IfcBuildingStorey", "IfcBeam", "
                      "IfcPile", "IfcFooting", "IfcReinforcingBar", "IfcTendon"]
 # TODO : shading device not supported?
 
-if open.__module__ == '__builtin__':
+if open.__module__ in ['__builtin__','io']:
     pyopen = open # because we'll redefine open below
 
 def open(filename,skip=None):
diff --git a/src/Mod/Arch/importOBJ.py b/src/Mod/Arch/importOBJ.py
index f47c7512e..ba25d609a 100644
--- a/src/Mod/Arch/importOBJ.py
+++ b/src/Mod/Arch/importOBJ.py
@@ -40,7 +40,7 @@ else:
 
 p = Draft.precision()
 
-if open.__module__ == '__builtin__':
+if open.__module__ in ['__builtin__','io']:
     pythonopen = open
 
 def findVert(aVertex,aList):
diff --git a/src/Mod/Arch/importSH3D.py b/src/Mod/Arch/importSH3D.py
index 7fabdb2c7..e34ec8bcb 100644
--- a/src/Mod/Arch/importSH3D.py
+++ b/src/Mod/Arch/importSH3D.py
@@ -34,7 +34,7 @@ import os,zipfile,xml.sax,FreeCAD,Part,Draft,Arch,Mesh,tempfile,math,Sketcher
 
 DEBUG = True
 
-if open.__module__ == '__builtin__':
+if open.__module__ in ['__builtin__','io']:
     pyopen = open # because we'll redefine open below
 
 
diff --git a/src/Mod/Arch/importWebGL.py b/src/Mod/Arch/importWebGL.py
index d22ea5637..7f8489f73 100644
--- a/src/Mod/Arch/importWebGL.py
+++ b/src/Mod/Arch/importWebGL.py
@@ -116,7 +116,7 @@ template = """<!DOCTYPE html>
         </html>"""
 
 
-if open.__module__ == '__builtin__':
+if open.__module__ in ['__builtin__','io']:
     pythonopen = open
     
 def export(exportList,filename):
diff --git a/src/Mod/Draft/importAirfoilDAT.py b/src/Mod/Draft/importAirfoilDAT.py
index 99a15df5c..0e384e6ba 100644
--- a/src/Mod/Draft/importAirfoilDAT.py
+++ b/src/Mod/Draft/importAirfoilDAT.py
@@ -34,7 +34,7 @@ import re, FreeCAD, FreeCADGui, Part, cProfile, os, string
 from FreeCAD import Vector, Base
 from Draft import makeWire
 
-if open.__module__ == '__builtin__':
+if open.__module__ in ['__builtin__','io']:
         pythonopen = open
 
 useDraftWire = True
diff --git a/src/Mod/Draft/importDXF.py b/src/Mod/Draft/importDXF.py
index 9b5a32ff7..955caef9f 100644
--- a/src/Mod/Draft/importDXF.py
+++ b/src/Mod/Draft/importDXF.py
@@ -65,7 +65,7 @@ dxfReader = None
 dxfColorMap = None
 dxfLibrary = None
 
-if open.__module__ == '__builtin__':
+if open.__module__ in ['__builtin__','io']:
     pythonopen = open # to distinguish python built-in open function from the one declared here
 
 
diff --git a/src/Mod/Draft/importOCA.py b/src/Mod/Draft/importOCA.py
index 896d7f781..f8cb5769e 100644
--- a/src/Mod/Draft/importOCA.py
+++ b/src/Mod/Draft/importOCA.py
@@ -45,7 +45,7 @@ try: import FreeCADGui
 except ValueError: gui = False
 else: gui = True
 
-if open.__module__ == '__builtin__':
+if open.__module__ in ['__builtin__','io']:
     pythonopen = open
     
 params = FreeCAD.ParamGet("User parameter:BaseApp/Preferences/Mod/Draft")
diff --git a/src/Mod/Draft/importSVG.py b/src/Mod/Draft/importSVG.py
index fb4184565..74ecff8c2 100644
--- a/src/Mod/Draft/importSVG.py
+++ b/src/Mod/Draft/importSVG.py
@@ -55,7 +55,7 @@ else: gui = True
 try: draftui = FreeCADGui.draftToolBar
 except AttributeError: draftui = None
 
-if open.__module__ == '__builtin__':
+if open.__module__ in ['__builtin__','io']:
   pythonopen = open
 
 svgcolors = {