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diff --git a/python/astra/astra_c.pyx b/python/astra/astra_c.pyx
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+#-----------------------------------------------------------------------
+#Copyright 2013 Centrum Wiskunde & Informatica, Amsterdam
+#
+#Author: Daniel M. Pelt
+#Contact: D.M.Pelt@cwi.nl
+#Website: http://dmpelt.github.io/pyastratoolbox/
+#
+#
+#This file is part of the Python interface to the
+#All Scale Tomographic Reconstruction Antwerp Toolbox ("ASTRA Toolbox").
+#
+#The Python interface to the ASTRA Toolbox is free software: you can redistribute it and/or modify
+#it under the terms of the GNU General Public License as published by
+#the Free Software Foundation, either version 3 of the License, or
+#(at your option) any later version.
+#
+#The Python interface to the ASTRA Toolbox is distributed in the hope that it will be useful,
+#but WITHOUT ANY WARRANTY; without even the implied warranty of
+#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+#GNU General Public License for more details.
+#
+#You should have received a copy of the GNU General Public License
+#along with the Python interface to the ASTRA Toolbox. If not, see <http://www.gnu.org/licenses/>.
+#
+#-----------------------------------------------------------------------
+# distutils: language = c++
+# distutils: libraries = astra
+
+include "config.pxi"
+import six
+from .utils import wrap_from_bytes
+
+from libcpp.string cimport string
+from libcpp cimport bool
+cdef extern from "astra/Globals.h" namespace "astra":
+    int getVersion()
+    string getVersionString()
+    bool cudaEnabled()
+
+IF HAVE_CUDA==True:
+  cdef extern from "../cuda/2d/darthelper.h" namespace "astraCUDA":
+      bool setGPUIndex(int)
+ELSE:
+  def setGPUIndex():
+    pass
+
+def credits():
+    six.print_("""
+All Scale Tomographic Reconstruction Antwerp Toolbox (ASTRA-Toolbox)
+was developed at the University of Antwerp by
+    * Prof. dr. Joost Batenburg
+    * Andrei Dabravolski
+    * Gert Merckx
+    * Willem Jan Palenstijn
+    * Tom Roelandts
+    * Prof. dr. Jan Sijbers
+    * dr. Wim van Aarle
+    * Sander van der Maar
+    * dr. Gert Van Gompel
+
+Python interface written by
+    * Daniel M. Pelt (CWI, Amsterdam)""")
+
+
+def use_cuda():
+    return cudaEnabled()
+
+
+def version(printToScreen=False):
+    if printToScreen:
+        six.print_(wrap_from_bytes(getVersionString()))
+    else:
+        return getVersion()
+
+def set_gpu_index(idx):
+    if use_cuda()==True:
+        ret = setGPUIndex(idx)
+        if not ret:
+            six.print_("Failed to set GPU " + str(idx))