Pull request #272: adding a fix for file descriptor

Merge in LCL/wolframclientforpython from bugfix/file-descriptor to master

* commit '3ca6aab0f6650cd00fa2e75b3a74bfa082de26e5':
  adding a fix for file descriptor

Author: crazyeng

wolframclient/serializers/encoder.py

@@ -75,6 +75,7 @@ def update_dispatch(self):
     # builtin libraries
     sys="wolframclient.serializers.encoders.builtin.encoder",
     decimal="wolframclient.serializers.encoders.decimal.encoder",
+    io="wolframclient.serializers.encoders.io.encoder",
     datetime="wolframclient.serializers.encoders.datetime.encoder",
     fractions="wolframclient.serializers.encoders.fractions.encoder",
     zoneinfo="wolframclient.serializers.encoders.zoneinfo.encoder",

wolframclient/serializers/encoders/io.py

@@ -0,0 +1,17 @@
+from __future__ import absolute_import, print_function, unicode_literals
+
+import io
+
+from wolframclient.utils.dispatch import Dispatch
+
+encoder = Dispatch()
+
+@encoder.dispatch(io.IOBase.__mro__)
+def encode_quantity(serializer, o):
+
+    # we need to patch io objects because we automatically attempt to convert classes that are iterable to a list, however it should not be done in this case. To be improved.
+
+    if serializer.object_processor:
+        return serializer.object_processor(serializer, o)
+
+    raise NotImplementedError("Cannot serialize object of class %s" % o.__class__)