Pull request #290: Bugfix/pandas nat clean

Merge in LCL/wolframclientforpython from bugfix/pandas-nat-clean to master

* commit '914236ef22f9bf9a0108d5b539ebedd95f776815':
  add test
  Encode the pandas NaT (not-a-time) singleton type (fixes #43)

Author: crazyeng

wolframclient/serializers/encoders/pandas.py

@@ -200,3 +200,8 @@ def encode_panda_series(serializer, o):
     if is_legacy_mode():
         return legacy_encode_series(serializer, o)
     return pyarrow_serialize(serializer, o.to_frame())
+
+
+@encoder.dispatch(pandas.NaT)
+def encode_pandas_not_a_time(serializer, o):
+    return serializer.serialize_symbol(b"Indeterminate")

wolframclient/tests/serializers/pandas.py

@@ -55,3 +55,15 @@ def test_serialization_works(self):
                 )
                 export(data, target_format="wl")
                 export(data, target_format="wxf")
+
+    def test_nat_encodes_as_indeterminate(self):
+        import pandas as pd
+
+        result = export(pd.NaT, target_format="wl")
+        self.assertEqual(result, b"Indeterminate")
+
+    def test_nat_wxf(self):
+        import pandas as pd
+
+        result = export(pd.NaT, target_format="wxf")
+        self.assertIn(b"Indeterminate", result)

wolframclient/utils/api.py

@@ -153,6 +153,7 @@
     SparseArray="pandas.SparseArray",
     RangeIndex="pandas.RangeIndex",
     ArrowDtype="pandas.ArrowDtype",
+    NaT="pandas.api.typing.NaTType",
 )
 
 pyarrow = API(