Move set_random() out of class

As generating a random Point is mostly not used on an existing object,
the method is now an independent function get_random() instead of a
class method.

point.py

@@ -31,31 +31,26 @@ class Point():
     def get_y(self):
         """Returns the Y-Coordinate of the Point"""
         return self.__y
-    def set_random(self, min_x=0, max_x=100, min_y=0, max_y=100):
-        """Set the point to a random place inside the boundaries"""
-        self.set_x(random.randint(min_x, max_x))
-        self.set_y(random.randint(min_y, max_y))
-        return self
     def str(self):
         """Returns the coordinates as a string"""
         return "(" + str(self.get_x()) + "/" + str(self.get_y()) + ")"
     def draw(self):
         """TODO: Draw the point in a canvas"""
 
+def get_random(min_x=0, max_x=100, min_y=0, max_y=100):
+    """Set the point to a random place inside the boundaries"""
+    return Point(random.randint(min_x, max_x), random.randint(min_y, max_y))
 
-def sort_point_set(point_set, sort_by_y=False):
+def sort_set(point_set, sort_by_y=False):
     """Sort a Point set using merge sort"""
     num_compares = 0
-    for pnt in point_set:
-        if not isinstance(pnt, Point):
-            raise Exception("Elements of point set are not all of type point.Point")
     if len(point_set) > 1:
         mid = len(point_set)//2 #Finding the mid of the array
         left = copy.deepcopy(point_set[:mid]) # Dividing the array elements
         right = copy.deepcopy(point_set[mid:]) # into 2 halves
 
-        num_compares += sort_point_set(left, sort_by_y) # Sorting the first half
-        num_compares += sort_point_set(right, sort_by_y) # Sorting the second half
+        num_compares += sort_set(left, sort_by_y) # Sorting the first half
+        num_compares += sort_set(right, sort_by_y) # Sorting the second half
 
         i = j = k = 0