updated contents from Atlas repo

patterns-func/promotions.py

@@ -0,0 +1,20 @@
+
+def fidelity_promo(order):
+    """5% discount for customers with 1000 or more fidelity points"""
+    return order.total() * .05 if order.customer.fidelity >= 1000 else 0
+
+
+def bulk_item_promo(order):
+    """10% discount for each LineItem with 20 or more units"""
+    discount = 0
+    for item in order.cart:
+        if item.quantity >= 20:
+            discount += item.total() * .1
+    return discount
+
+def large_order_promo(order):
+    """7% discount for orders with 10 or more distinct items"""
+    distinct_items = {item.product for item in order.cart}
+    if len(distinct_items) >= 10:
+        return order.total() * .07
+    return 0