kwargs.diff

diff --git a/canmatrix/canmatrix.py b/canmatrix/canmatrix.py
index 12b0eed..82eed9e 100644
--- a/canmatrix/canmatrix.py
+++ b/canmatrix/canmatrix.py
@@ -116,69 +116,47 @@ class Signal(object):
 #    def __init__(self, name, startbit, signalsize, is_little_endian, is_signed=False, factor=1, offset=0, min=0, max=0, unit="", receiver=[], multiplex=None):
     def __init__(self, name, **kwargs):
 
-        if 'startBit' in kwargs:
-            self._startbit = int(kwargs["startBit"])
-        else:
-            self._startbit = 0
- 
-        if 'signalSize' in kwargs:
-            self._signalsize = int(kwargs["signalSize"])
-        else:
-            self._signalsize = 0
-
-        if 'is_little_endian' in kwargs:
-            self._is_little_endian = kwargs["is_little_endian"]
-        else:
-            self._is_little_endian = True
-
-        if 'is_signed' in kwargs:
-            self._is_signed = kwargs["is_signed"]
-        else:
-            self._is_signed = True
-
-        if 'factor' in kwargs:
-            self._factor = float(kwargs["factor"])
-        else:
-            self._factor = float(1)
-
-        if 'offset' in kwargs:
-            self._offset = float(kwargs["offset"])
-        else:
-            self._offset = float(0)
- 
-        if 'min' in kwargs:
-            self._min = float(kwargs["min"])
-        else:
-            self._min = float(0)
-
-        if 'max' in kwargs:
-            self._max = float(kwargs["max"])
-        else:
-            self._max = float(0)
-
-        if 'unit' in kwargs:
-            self._unit = kwargs["unit"]
-        else:
-            self._unit = ""
+        def multiplex(value):
+            if value is not None and value != 'Multiplexor':
+                multiplex = int(value)
+            else:
+                multiplex = value
+            return multiplex
+
+        args = [
+            ('startBit', '_startbit', int, 0),
+            ('signalSize', '_signalsize', int, 0),
+            ('is_little_endian', '_is_little_endian', bool, True),
+            ('is_signed', '_is_signed', bool, True),
+            ('factor', '_factor', float, 1),
+            ('offset', '_offset', float, 0),
+            ('min', '_min', float, 0),
+            ('max', '_max', float, 0),
+            ('unit', '_unit', str, ""),
+            ('receiver', '_receiver', None, []),
+            ('comment', '_comment', str, None),
+            ('multiplex', '_multiplex', multiplex, None)
+        ]
+
+        for arg_name, destination, function, default in args:
+            try:
+                value = kwargs[arg_name]
+            except KeyError:
+                value = default
+            else:
+                kwargs.pop(arg_name)
 
-        if 'receiver' in kwargs:
-            self._receiver = kwargs["receiver"]
-        else:
-            self._receiver = []
+            if function is not None:
+                value = function(value)
 
-        if 'comment' in kwargs:
-            self._comment = kwargs["comment"]
-        else:
-            self._comment = None
+            setattr(self, destination, value)
 
-        if 'multiplex' in kwargs:
-            if kwargs["multiplex"] is not None and kwargs["multiplex"] != 'Multiplexor':
-                multiplex = int(kwargs["multiplex"])
-            else:
-                multiplex = kwargs["multiplex"]
-            self._multiplex = multiplex
-        else:
-            self._multiplex = None
+        if len(kwargs) > 0:
+            raise TypeError('{}() got unexpected argument{} {}'.format(
+                self.__class__.__name__,
+                's' if len(kwargs) > 1 else '',
+                ', '.join(kwargs.keys())
+            ))
 
         self._name = name
         self._attributes = {}