explicitly set language_level=3 for cython

Author: grlee77

pywt/_extensions/_cwt.pyx

@@ -1,6 +1,7 @@
-#cython: boundscheck=False, wraparound=False
-cimport common, c_wt
-from common cimport pywt_index_t, MODE
+#cython: language_level=3, boundscheck=False, wraparound=False
+from . cimport common
+from . cimport c_wt
+from .common cimport pywt_index_t, MODE
 from ._pywt cimport _check_dtype
 
 cimport numpy as np

pywt/_extensions/_dwt.pyx

@@ -1,6 +1,7 @@
-#cython: boundscheck=False, wraparound=False
-cimport common, c_wt
-from common cimport pywt_index_t, MODE
+#cython: language_level=3, boundscheck=False, wraparound=False
+from . cimport common
+from . cimport c_wt
+from .common cimport pywt_index_t, MODE
 from ._pywt cimport _check_dtype
 
 cimport numpy as np

pywt/_extensions/_pywt.pxd

@@ -1,4 +1,4 @@
-cimport wavelet
+from . cimport wavelet
 cimport numpy as np
 include "config.pxi"
 

pywt/_extensions/_pywt.pyx

@@ -1,5 +1,6 @@
+#cython: language_level=3
 # Copyright (c) 2006-2012 Filip Wasilewski <http://en.ig.ma/>
-# Copyright (c) 2012-2016 The PyWavelets Developers
+# Copyright (c) 2012-2018 The PyWavelets Developers
 #                         <https://github.com/PyWavelets/pywt>
 # See COPYING for license details.
 
@@ -11,8 +12,8 @@ __all__ = ['MODES', 'Modes', 'DiscreteContinuousWavelet', 'Wavelet',
 import warnings
 import re
 
-cimport c_wt
-cimport common
+from . cimport c_wt
+from . cimport common
 from ._dwt cimport upcoef
 from ._cwt cimport cwt_psi_single
 
@@ -1044,7 +1045,7 @@ cpdef np.dtype _check_dtype(data):
 def keep(arr, keep_length):
     length = len(arr)
     if keep_length < length:
-        left_bound = (length - keep_length) / 2
+        left_bound = (length - keep_length) // 2
         return arr[left_bound:left_bound + keep_length]
     return arr
 

pywt/_extensions/_swt.pyx

@@ -1,12 +1,12 @@
-#cython: boundscheck=False, wraparound=False
-cimport common
-cimport c_wt
+#cython: language_level=3, boundscheck=False, wraparound=False
+from . cimport common
+from . cimport c_wt
 
 import warnings
 import numpy as np
 cimport numpy as np
 
-from common cimport pywt_index_t
+from .common cimport pywt_index_t
 from ._pywt cimport c_wavelet_from_object, cdata_t, Wavelet, _check_dtype
 
 include "config.pxi"

pywt/_extensions/c_wt.pxd

@@ -3,9 +3,9 @@
 #                         <https://github.com/PyWavelets/pywt>
 # See COPYING for license details.
 
-from common cimport (MODE, pywt_index_t, ArrayInfo, Coefficient,
-                     DiscreteTransformType)
-from wavelet cimport DiscreteWavelet, ContinuousWavelet
+from .common cimport (MODE, pywt_index_t, ArrayInfo, Coefficient,
+                      DiscreteTransformType)
+from .wavelet cimport DiscreteWavelet, ContinuousWavelet
 
 include "config.pxi"
 

pywt/_extensions/wavelet.pxd

@@ -1,4 +1,4 @@
-from common cimport pywt_index_t
+from .common cimport pywt_index_t
 
 cdef extern from "c/wavelets.h":
     ctypedef enum SYMMETRY: