package correct precalc data for Python 2.7 and 3.4

setup.py

@@ -35,6 +35,33 @@
     sys.exit("Cython not found. Cython is needed to build the extension modules for pydgq.")
 
 
+#########################################################
+# HACK: Attempt to package the correct data file on POSIX
+#########################################################
+
+redirect_name = os.path.join("pydgq", "pydgq_data.bin")
+file_27_name  = os.path.join("pydgq", "pydgq_data_27.bin")
+file_34_name  = os.path.join("pydgq", "pydgq_data_34.bin")
+
+# remove existing symlink or file if any
+#
+try:
+    os.remove( redirect_name )
+except FileNotFoundError:
+    pass
+
+# symlink correct file depending on Python version
+#
+# (FIXME/TODO: for now, we assume that setup.py is running under the same Python version the packaged library will run under)
+#
+if sys.version_info < (3,0):
+    print("Packaging %s as %s" % (file_27_name, redirect_name))
+    os.symlink( file_27_name, redirect_name )
+else:
+    print("Packaging %s as %s" % (file_34_name, redirect_name))
+    os.symlink( file_34_name, redirect_name )
+
+
 #########################################################
 # Definitions
 #########################################################
@@ -229,3 +256,11 @@ def ext_math(extName):
     data_files = datafiles
 )
 
+
+# remove symlink created earlier
+#
+try:
+    os.remove( redirect_name )
+except FileNotFoundError:
+    pass
+