Add activation method, fix printing

Perceptron.py

@@ -1,18 +1,32 @@
 from Input import Input
 
-
 class Perceptron(object):
 
         def __init__(self):
             self.inputs = {}
 
         def print(self):
-            for key, value in self.inputs:
-                print("%s - )") % key
-                value.print()
+            for key in self.inputs:
+                print(key + ":")
+                self.inputs[key].print()
 
-        def addinput(self, p_name, p_value, p_weight):
+        def add_input(self, p_name, p_value, p_weight):
             self.inputs[p_name] = Input(p_value, p_weight)
 
-        def setweight(self, p_input, p_weight):
+        def set_weight(self, p_input, p_weight):
             self.inputs[p_input].weight = p_weight
+
+        def _sum_inputs(self):
+            total = 0
+            for key, value in self.inputs.items():
+                total += value.output()
+            return total
+
+        def activation(self):
+            input = self._sum_inputs()
+            print("Total = %f" % input)
+
+            if input > 0:
+                return True
+            else:
+                return False