Convert to class

src/individual.py

@@ -1,6 +1,14 @@
 from math import pow, sin, pi
 
 
-def fitness_function(x, y):
+class Individual(object):
+
+    def __init__(self, x, y):
+        self.x = x
+        self.y = y
+
+    def fitness_function(self):
+        x = self.x
+        y = self.y
         n = 9
         return pow(15*x*y*(1-x)*(1-y)*sin(n*pi*x)*sin(n*pi*y), 2)