🐛 python2 does not have io.UnsupportedOperation

pyexcel_io/book.py

@@ -7,10 +7,8 @@
     :copyright: (c) 2014-2017 by Onni Software Ltd.
     :license: New BSD License, see LICENSE for more details
 """
-from io import UnsupportedOperation
-
 import pyexcel_io.manager as manager
-from pyexcel_io._compact import OrderedDict, isstream
+from pyexcel_io._compact import OrderedDict, isstream, PY2
 from .constants import (
     MESSAGE_ERROR_03,
     MESSAGE_WRONG_IO_INSTANCE
@@ -179,18 +177,22 @@ class BookWriter(RWInterface):
         """
         if not isstream(file_stream):
             raise IOError(MESSAGE_ERROR_03)
-        if not hasattr(file_stream, 'seek'):
-            # python 2
-            # Hei zipfile in odfpy would do a seek
-            # but stream from urlib cannot do seek
-            file_stream = _convert_content_to_stream(
-                file_stream.read(), self._file_type)
-        try:
-            file_stream.seek(0)
-        except UnsupportedOperation:
-            # python 3
-            file_stream = _convert_content_to_stream(
-                file_stream.read(), self._file_type)
+        if PY2:
+            if not hasattr(file_stream, 'seek'):
+                # python 2
+                # Hei zipfile in odfpy would do a seek
+                # but stream from urlib cannot do seek
+                file_stream = _convert_content_to_stream(
+                    file_stream.read(), self._file_type)
+        else:
+            from io import UnsupportedOperation
+
+            try:
+                file_stream.seek(0)
+            except UnsupportedOperation:
+                # python 3
+                file_stream = _convert_content_to_stream(
+                    file_stream.read(), self._file_type)
         self.open(file_stream, **keywords)
 
     def open_content(self, file_stream, **keywords):