Fixed bug 625 in Draft importers

src/Mod/Draft/importAirfoilDAT.py

@@ -28,7 +28,9 @@ import re, FreeCAD, FreeCADGui, Part, cProfile, os, string
 from FreeCAD import Vector, Base
 from Draft import *
 
-pythonopen = open
+if open.__module__ == '__builtin__':
+        pythonopen = open
+
 useDraftWire = True
 
 def decodeName(name):
@@ -53,10 +55,10 @@ def open(filename):
 def insert(filename,docname):
 	"called when freecad imports a file"
 	groupname = os.path.splitext(os.path.basename(filename))[0]
-	try:
-		doc=FreeCAD.getDocument(docname)
-	except:
-		doc=FreeCAD.newDocument(docname)
+	try:
+		doc=FreeCAD.getDocument(docname)
+	except:
+		doc=FreeCAD.newDocument(docname)
 	importgroup = doc.addObject("App::DocumentObjectGroup",groupname)
 	importgroup.Label = decodeName(groupname)
 	process(doc,filename)

src/Mod/Draft/importDXF.py

@@ -52,7 +52,8 @@ else: gui = True
 try: draftui = FreeCADGui.draftToolBar
 except: draftui = None
 
-pythonopen = open # to distinguish python built-in open function from the one declared here
+if open.__module__ == '__builtin__':
+    pythonopen = open # to distinguish python built-in open function from the one declared here
 
 def prec():
     "returns the current Draft precision level"

src/Mod/Draft/importOCA.py

@@ -37,7 +37,9 @@ try: import FreeCADGui
 except ValueError: gui = False
 else: gui = True
 
-pythonopen = open
+if open.__module__ == '__builtin__':
+    pythonopen = open
+    
 params = FreeCAD.ParamGet("User parameter:BaseApp/Preferences/Mod/Draft")
 
 def getpoint(data):

src/Mod/Draft/importSVG.py

@@ -48,7 +48,8 @@ else: gui = True
 try: draftui = FreeCADGui.draftToolBar
 except: draftui = None
 
-pythonopen = open
+if open.__module__ == '__builtin__':
+  pythonopen = open
 
 svgcolors = {
 	  'Pink': (255, 192, 203),