fixed relative imports (language_level=2), need to be explicit for python3 (language_level=3)

pygmx/enxio.pyx

@@ -5,8 +5,8 @@ from array import array
 #cimport numpy as np
 import numpy as np
 
-from utility cimport *
-from mdtypes cimport *
+from .utility cimport *
+from .mdtypes cimport *
 
 cdef extern from "gromacs/fileio/enxio.h":
     ctypedef struct gmx_enxnm_t:

pygmx/fileio.pxd

@@ -1,6 +1,6 @@
 from libc.stdio cimport FILE
 
-from utility cimport *
+from .utility cimport *
 
 #cdef extern from "gromacs/fileio/gmx_system_xdr.h":
 #    ctypedef struct XDR:

pygmx/math.pxd

@@ -1,5 +1,5 @@
 
-from utility cimport real
+from .utility cimport real
 
 cdef extern from "gromacs/math/vectypes.h":
     ctypedef real   rvec[3]

pygmx/mdtypes.pxd

@@ -1,6 +1,6 @@
 
-from utility cimport *
-from math cimport *
+from .utility cimport *
+from .math cimport *
 
 cdef extern from "gromacs/trajectory/energy.h":
     ctypedef struct t_energy:

pygmx/topology.pxd

@@ -1,9 +1,9 @@
 
 from libc.stdio cimport FILE
 
-from utility cimport *
-from math cimport *
-from mdtypes cimport *
+from .utility cimport *
+from .math cimport *
+from .mdtypes cimport *
 
 cdef extern from "gromacs/topology/atoms.h":
     ctypedef struct t_atom:

pygmx/tpxio.pyx

@@ -8,10 +8,10 @@ import numpy as np
 import cython
 cimport numpy as np
 
-from utility cimport *
-from math cimport *
-from mdtypes cimport *
-from topology cimport *
+from .utility cimport *
+from .math cimport *
+from .mdtypes cimport *
+from .topology cimport *
 
 
 cdef extern from "gromacs/fileio/tpxio.h":

pygmx/xtcio.pyx

@@ -9,9 +9,9 @@ import numpy as np
 cimport numpy as np
 import os
 
-from utility cimport *
-from math cimport *
-from fileio cimport *
+from .utility cimport *
+from .math cimport *
+from .fileio cimport *
 from .gromacs.reader import INDEX_MAGIC, SubscriptableReader, XTCFrame
 from .errors import InvalidIndexException, InvalidMagicException, XTCError
 
@@ -288,4 +288,4 @@ def append_xtcfile(filename, step, time, box, coords, prec):
 
 
 
-    
+