Fix small Python errors

3 files changed, 5 insertions, 3 deletions

diff --git a/python/astra/data3d.py b/python/astra/data3d.py
index e5ef6b0..f143659 100644
--- a/python/astra/data3d.py
+++ b/python/astra/data3d.py
@@ -89,7 +89,7 @@ def get_single(i):
     :returns: :class:`numpy.ndarray` -- The object data.
 
     """
-    return g.get_single(i)
+    return d.get_single(i)
 
 def store(i,data):
     """Fill existing 3D object with data.
diff --git a/python/astra/functions.py b/python/astra/functions.py
index e38b5bc..3f4aa82 100644
--- a/python/astra/functions.py
+++ b/python/astra/functions.py
@@ -115,7 +115,7 @@ def add_noise_to_sino(sinogram_in, I0, seed=None):
     sinogram_out = -max_sinogramRaw * np.log(sinogramCT_D)
 
     if not isinstance(sinogram_in, np.ndarray):
-        at.data2d.store(sinogram_in, sinogram_out)
+        data2d.store(sinogram_in, sinogram_out)
 
     if not seed==None:
         np.random.set_state(curstate)
diff --git a/python/astra/optomo.py b/python/astra/optomo.py
index 4a64150..dd10713 100644
--- a/python/astra/optomo.py
+++ b/python/astra/optomo.py
@@ -160,7 +160,7 @@ class OpTomo(scipy.sparse.linalg.LinearOperator):
             return self._matvec(v)
         return scipy.sparse.linalg.LinearOperator.__mul__(self, v)
 
-    def reconstruct(self, method, s, iterations=1, extraOptions = {}):
+    def reconstruct(self, method, s, iterations=1, extraOptions = None):
         """Reconstruct an object.
 
         :param method: Method to use for reconstruction.
@@ -172,6 +172,8 @@ class OpTomo(scipy.sparse.linalg.LinearOperator):
         :param extraOptions: Extra options to use during reconstruction (i.e. for cfg['option']).
         :type extraOptions: :class:`dict`
         """
+        if extraOptions is None:
+            extraOptions={}
         s = self.__checkArray(s, self.sshape)
         sid = self.data_mod.link('-sino',self.pg,s)
         v = np.zeros(self.vshape,dtype=np.float32)