Add a python version identifier

CHANGELOG.md

@@ -10,6 +10,7 @@ Change Log
 - A new code example, `chunk`, shows how to perform (de)compression in chunks.
 - A new utility function `zfp_block_maximum_size()` returns maximum block size
   for given scalar type, dimensionality, and compression mode.
+- `zfpy.__version__` for straightfoward access to the zfp version string in Python.
 
 ### Fixed
 

python/zfpy.pxd

@@ -11,6 +11,7 @@ cdef extern from "zfp/bitstream.h":
     void stream_close(bitstream* stream)
 
 cdef extern from "zfp.h":
+    cython.char * ZFP_VERSION_STRING
     # enums
     ctypedef enum zfp_type:
         zfp_type_none   = 0,

python/zfpy.pyx

@@ -37,6 +37,8 @@ mode_fixed_rate = zfp_mode_fixed_rate
 mode_fixed_precision = zfp_mode_fixed_precision
 mode_fixed_accuracy = zfp_mode_fixed_accuracy
 
+__version__ = str(ZFP_VERSION_STRING, encoding='utf-8')
+
 
 cpdef dtype_to_ztype(dtype):
     if dtype == np.int32:

tests/python/test_numpy.py

@@ -10,6 +10,11 @@
 except ImportError:
     version_parse = None
 
+def test_zfpy_version():
+    # Just ensure that the version contains 3 numbers separated by dots
+    assert len(zfpy.__version__.split('.')) == 3
+    # Ensure it is a string, not bytes
+    assert isinstance(zfpy.__version__, str)
 
 class TestNumpy(unittest.TestCase):
     def lossless_round_trip(self, orig_array):