kwant/linalg/__init__.py

@@ -10,7 +10,10 @@ __all__ = ['lapack']
 from . import lapack
 
 # Merge the public interface of the other submodules.
-for module in ['decomp_lu', 'decomp_ev', 'decomp_schur']:
-    exec('from . import {0}'.format(module))
-    exec('from .{0} import *'.format(module))
-    exec('__all__.extend({0}.__all__)'.format(module))
+from .decomp_lu import *
+from .decomp_schur import *
+from .decomp_ev import *
+
+__all__.extend([decomp_lu.__all__,
+                decomp_ev.__all__,
+                decomp_schur.__all__])

kwant/linalg/tests/test_mumps.py

@@ -65,7 +65,7 @@ def test_schur_complement_with_dense():
 def test_error_minus_9(r=10):
     """Test if MUMPSError -9 is properly caught by increasing memory"""
 
-    graphene = honeycomb()
+    graphene = honeycomb(norbs=1)
     a, b = graphene.sublattices
 
     def circle(pos):

kwant/physics/leads.py

@@ -173,11 +173,11 @@ class StabilizedModes:
         Translation eigenvectors divided by the corresponding eigenvalues.
     nmodes : int
         Number of left-moving (or right-moving) modes.
-    sqrt_hop : numpy array or None
-        Part of the SVD of `h_hop`, or None if the latter is invertible.
+    sqrt_hop : numpy array
+        Part of the SVD of `h_hop`.
     """
 
-    def __init__(self, vecs, vecslmbdainv, nmodes, sqrt_hop=None):
+    def __init__(self, vecs, vecslmbdainv, nmodes, sqrt_hop):
         kwargs = locals()
         kwargs.pop('self')
         self.__dict__.update(kwargs)