Added hashing methods for sets/dictionaries.

EasyGA/structure/chromosome.py

@@ -112,6 +112,11 @@ class Chromosome():
         return self.gene_list == chromosome.gene_list
 
 
+    def __hash__(self):
+        """Hash chromosomes by genes so they can be used in sets/dictionaries."""
+        return hash(tuple(self))
+
+
     def __add__(self, chromosome):
         """Return self + chromosome, a chromosome made by concatenating the genes."""
         return Chromosome(chain(self, chromosome))

EasyGA/structure/gene.py

@@ -19,6 +19,11 @@ class Gene:
         return self.value == Gene(other_gene).value
 
 
+    def __hash__(self):
+        """Hash genes by value so that they can be used in sets/dictionaries."""
+        return hash(self.value)
+
+
     def __repr__(self):
         """
         Allows the user to use