Merge pull request #3 from bwllc/WIP

Update gcodes.py

src/pygcode/gcodes.py

@@ -211,6 +211,14 @@ class GCode(object):
             parameters=param_str,
         )
     
+    def __hash__(self):
+        """Hash representation of the gcode, for set and dictionary usage"""
+        try:
+            return hash(self.word_key)
+        except TypeError:
+            return hash(self.word_letter) # May also want to retrieve additional value info
+        
+
     def _default_word(self):
         if self.default_word:
             return copy(self.default_word)