ENH make sure it pickls

psfex/psfex_lib.py

@@ -128,5 +128,17 @@ def _load_from_fits(self, fits, ext=DEFAULT_EXT):
                                           self['contextscale'],
                                           self['psf_samp'],
                                           self._psf_mask)
-
-
+
+    def __getstate__(self):
+        state = self.__dict__.copy()
+        del state['_psfex']
+        return state
+
+    def __setstate__(self, state):
+        self.__dict__.update(state)
+        self._psfex = _psfex_pywrap.PSFEx(self['masksize'],
+                                          self['poldeg'],
+                                          self['contextoffset'],
+                                          self['contextscale'],
+                                          self['psf_samp'],
+                                          self._psf_mask)

psfex/tests/test_pickles.py

@@ -0,0 +1,28 @@
+import os
+import io
+import pickle
+import numpy as np
+
+from ..psfex_lib import PSFEx
+
+
+def test_pickles():
+    fname = os.path.join(
+        os.path.dirname(os.path.realpath(__file__)),
+        'test_psfcat.psf'
+    )
+
+    psf = PSFEx(fname)
+    im = psf.get_rec(10, 11)
+
+    val = io.BytesIO()
+    pickle.dump(psf, val)
+    val.flush()
+    val.seek(0)
+    new_psf = pickle.load(val)
+    new_im = new_psf.get_rec(10, 11)
+
+    assert np.array_equal(new_im, im)
+
+    # also make sure old object still works
+    assert np.array_equal(im, psf.get_rec(10, 11))