remove Py2vs3 code hybridized using sys.version

Author: a-detiste

nixio/block.py

@@ -15,7 +15,6 @@
     from collections.abc import OrderedDict
 except ImportError:
     from collections import OrderedDict
-import sys
 
 from .util import find as finders
 from .compression import Compression
@@ -299,13 +298,6 @@ def create_data_frame(self, name="", type_="", col_dict=None,
             return self.data_frames[objid]
 
         util.check_entity_name_and_type(name, type_)
-        if (isinstance(col_dict, dict)
-                and not isinstance(col_dict, OrderedDict)
-                and sys.version_info[0] < 3):
-            raise TypeError("Cannot create a DataFrame from a dictionary "
-                            "in Python 2 as the order of keys is not "
-                            "preserved. Please use the OrderedDict class "
-                            "from the collections module instead.")
 
         if data is not None:
             shape = len(data)

nixio/test/test_data_array.py

@@ -8,7 +8,6 @@
 # LICENSE file in the root of the Project.
 import os
 import time
-import sys
 import unittest
 import numpy as np
 import nixio as nix
@@ -277,8 +276,7 @@ def test_data_array_dtype(self):
         assert da.dtype == test_data.dtype
 
         bdata = ['1', '2', '3', '4', '5', '6', '7', '8', '9', '0']
-        if sys.version_info[0] == 3:
-            bdata = [bytes(x, 'UTF-8') for x in bdata]
+        bdata = [bytes(x, 'UTF-8') for x in bdata]
 
         void_data = np.array(bdata, dtype='V1')
         da = self.block.create_data_array('dtype_opaque', 'b', data=void_data)

nixio/test/test_data_frame.py

@@ -9,7 +9,6 @@
     from collections.abc import OrderedDict
 except ImportError:
     from collections import OrderedDict
-import sys
 
 
 class TestDataFrame(unittest.TestCase):
@@ -219,11 +218,10 @@ def test_df_shape(self):
         assert tuple(self.df1.df_shape) == (10, 5)
         # create df with incorrect dimension to see if Error is raised
         arr = np.arange(1000).reshape(10, 10, 10)
-        if sys.version_info[0] == 3:
-            with self.assertRaises(ValueError):
-                self.block.create_data_frame('err', 'err',
-                                             {'name': np.int64},
-                                             data=arr)
+        with self.assertRaises(ValueError):
+            self.block.create_data_frame('err', 'err',
+                                         {'name': np.int64},
+                                         data=arr)
 
     def test_data_type(self):
         assert self.df1.dtype[4] == np.int32