updated contents from Atlas repo

sequences/bisect_demo_pos.py

@@ -0,0 +1,20 @@
+import random
+import collections
+
+SIZE = 15
+
+random.seed(1729)
+
+target_list = [random.randrange(SIZE*2) for i in range(SIZE)]
+target_list.sort()
+
+random.seed(1729)
+display_list = ['    '] * SIZE
+occurrences = collections.Counter()
+for i in range(SIZE):
+    new_item = random.randrange(SIZE*2)
+    pos = target_list.index(new_item) + occurrences[new_item]
+    occurrences[new_item] += 1
+    display_list[pos] = '%2s, ' % new_item
+    print('[' + ''.join(display_list) + ']')
+