Renamed files

src/survivor/Survivor.py

@@ -0,0 +1,51 @@
+from EasyGA import function_info
+import random
+
+
+@function_info
+def _append_to_next_population(survivor_method):
+    """Appends the selected chromosomes to the next population."""
+
+    def new_method(ga):
+        ga.population.append_children(survivor_method(ga))
+
+    return new_method
+
+
+@_append_to_next_population
+def fill_in_best(ga):
+    """Fills in the next population with the best chromosomes from the last population"""
+
+    needed_amount = len(ga.population) - len(ga.population.next_population)
+    return ga.population[:needed_amount]
+
+
+@_append_to_next_population
+def fill_in_random(ga):
+    """Fills in the next population with random chromosomes from the last population"""
+
+    needed_amount = len(ga.population) - len(ga.population.next_population)
+    return random.sample(ga.population, needed_amount)
+
+
+@_append_to_next_population
+def fill_in_parents_then_random(ga):
+    """Fills in the next population with all parents followed by random chromosomes from the last population"""
+
+    # Remove dupes from the mating pool
+    mating_pool = set(ga.population.mating_pool)
+
+    needed_amount = len(ga.population) - len(ga.population.next_population)
+    parent_amount = min(needed_amount, len(mating_pool))
+    random_amount = needed_amount - parent_amount
+
+    # Only parents are used.
+    if random_amount == 0:
+        return ga.population.mating_pool[:parent_amount]
+
+    # Parents need to be removed from the random sample to avoid dupes.
+    else:
+        return mating_pool + random.sample(
+                                 set(ga.population) - mating_pool,
+                                 random_amount
+                             )