Minor linting nitpicks and Python 2 removal (#441)

* Removed py2 handling in import_eds
* Made file open more robust in import_eds

* Additional whitespace removals

canopen/lss.py

@@ -239,12 +239,12 @@ def send_identify_non_configured_remote_slave(self):
         self.__send_command(message)
 
     def fast_scan(self):
-        """This command sends a series of fastscan message 
+        """This command sends a series of fastscan message
         to find unconfigured slave with lowest number of LSS idenities
 
         :return:
             True if a slave is found.
-            False if there is no candidate. 
+            False if there is no candidate.
             list is the LSS identities [vendor_id, product_code, revision_number, serial_number]
         :rtype: bool, list
         """

canopen/network.py

@@ -298,7 +298,7 @@ def __init__(
         bus,
         remote: bool = False,
     ):
-        """ 
+        """
         :param can_id:
             CAN-ID of the message
         :param data:

canopen/objectdictionary/eds.py

@@ -19,19 +19,17 @@
 def import_eds(source, node_id):
     eds = RawConfigParser(inline_comment_prefixes=(';',))
     eds.optionxform = str
-    if hasattr(source, "read"):
-        fp = source
-    else:
-        fp = open(source)
+    opened_here = False
     try:
-        # Python 3
+        if hasattr(source, "read"):
+            fp = source
+        else:
+            fp = open(source)
+            opened_here = True
         eds.read_file(fp)
-    except AttributeError:
-        # Python 2
-        eds.readfp(fp)
     finally:
         # Only close object if opened in this fn
-        if not hasattr(source, "read"):
+        if opened_here:
             fp.close()
 
     od = ObjectDictionary()
@@ -208,7 +206,7 @@ def _calc_bit_length(data_type):
 def _signed_int_from_hex(hex_str, bit_length):
     number = int(hex_str, 0)
     max_value = (1 << (bit_length - 1)) - 1
-    
+
     if number > max_value:
         return number - (1 << bit_length)
     else:

canopen/sdo/client.py

@@ -86,7 +86,7 @@ def request_response(self, sdo_request):
             except SdoCommunicationError as e:
                 retries_left -= 1
                 if not retries_left:
-                    self.abort(0x5040000) 
+                    self.abort(0x5040000)
                     raise
                 logger.warning(str(e))
 
@@ -463,7 +463,7 @@ def __init__(self, sdo_client, index, subindex=0, request_crc_support=True):
         :param int subindex:
             Object dictionary sub-index to read from.
         :param bool request_crc_support:
-            If crc calculation should be requested when using block transfer            
+            If crc calculation should be requested when using block transfer
         """
         self._done = False
         self.sdo_client = sdo_client
@@ -628,7 +628,7 @@ def __init__(self, sdo_client, index, subindex=0, size=None, request_crc_support
         :param int size:
             Size of data in number of bytes if known in advance.
         :param bool request_crc_support:
-            If crc calculation should be requested when using block transfer            
+            If crc calculation should be requested when using block transfer
         """
         self.sdo_client = sdo_client
         self.size = size
@@ -755,7 +755,7 @@ def _block_ack(self):
         logger.debug("Server requested a block size of %d", blksize)
         self._blksize = blksize
         self._seqno = 0
-        
+
     def _retransmit(self, ackseq, blksize):
         """Retransmit the failed block"""
         logger.info(("%d of %d sequences were received. "

canopen/sdo/server.py

@@ -203,7 +203,7 @@ def download(
         data: bytes,
         force_segment: bool = False,
     ):
-        """May be called to make a write operation without an Object Dictionary. 
+        """May be called to make a write operation without an Object Dictionary.
 
         :param index:
             Index of object to write.

canopen/variable.py

@@ -61,11 +61,9 @@ def raw(self) -> Union[int, bool, float, str, bytes]:
         +---------------------------+----------------------------+
         | REALxx                    | :class:`float`             |
         +---------------------------+----------------------------+
-        | VISIBLE_STRING            | :class:`str` /             |
-        |                           | ``unicode`` (Python 2)     |
+        | VISIBLE_STRING            | :class:`str`               |
         +---------------------------+----------------------------+
-        | UNICODE_STRING            | :class:`str` /             |
-        |                           | ``unicode`` (Python 2)     |
+        | UNICODE_STRING            | :class:`str`               |
         +---------------------------+----------------------------+
         | OCTET_STRING              | :class:`bytes`             |
         +---------------------------+----------------------------+

examples/eds/e35.eds

@@ -5083,7 +5083,7 @@ DefaultValue=0
 PDOMapping=0x0
 
 [2C01subB]
-ParameterName=Accumulator divide register 
+ParameterName=Accumulator divide register
 ObjectType=0x7
 DataType=0x0004
 AccessType=wo
@@ -5099,7 +5099,7 @@ DefaultValue=0
 PDOMapping=0x0
 
 [2C01subD]
-ParameterName=Accumulator multiply register 
+ParameterName=Accumulator multiply register
 ObjectType=0x7
 DataType=0x0004
 AccessType=wo
@@ -5131,15 +5131,15 @@ DefaultValue=0
 PDOMapping=0x0
 
 [2C01sub11]
-ParameterName=Shift left accumulator by register 
+ParameterName=Shift left accumulator by register
 ObjectType=0x7
 DataType=0x0004
 AccessType=wo
 DefaultValue=0
 PDOMapping=0x0
 
 [2C01sub12]
-ParameterName=Shift right accumulator by register 
+ParameterName=Shift right accumulator by register
 ObjectType=0x7
 DataType=0x0004
 AccessType=wo
@@ -7835,7 +7835,7 @@ PDOMapping=0x0
 ParameterValue=0x2
 
 [1A02sub1]
-ParameterName=Position Actual Value 
+ParameterName=Position Actual Value
 ObjectType=0x7
 DataType=0x0007
 AccessType=rw

test/test_eds.py

@@ -157,7 +157,7 @@ def test_dummy_variable(self):
     def test_dummy_variable_undefined(self):
         with self.assertRaises(KeyError):
             var_undef = self.od['Dummy0001']
-    
+
     def test_reading_factor(self):
         var = self.od['EDS file extensions']['FactorAndDescription']
         self.assertEqual(var.factor, 0.1)
@@ -167,7 +167,7 @@ def test_reading_factor(self):
         self.assertEqual(var2.description, '')
         self.assertEqual(var2.factor, 1)
         self.assertEqual(var2.unit, '')
-        
+
 
 
     def test_comments(self):