Changeset 01b538c in rattail

Timestamp:

07/08/2022 12:48:39 PM (7 months ago)

Author:

Lance Edgar <lance@…>

Branches:

master

Children:

b5688a0

Parents:

a732a76c

Message:

Add basic pricing.calculate_markup() function

File:

• rattail/pricing.py (modified) (3 diffs)

rattail/pricing.py

@@ -3 +3 @@
 #
 #  Rattail -- Retail Software Framework
-#  Copyright © 2010-2019 Lance Edgar
+#  Copyright © 2010-2022 Lance Edgar
 #
 #  This file is part of Rattail.
@@ -26 +26 @@
 
 from __future__ import unicode_literals, absolute_import
-
-
-__all__ = ['gross_margin']
 
 
@@ -59 +56 @@
         return margin
     return 100 * margin
+
+
+def calculate_markup(margin):
+    """
+    Calculate the "markup" value corresponding to the given margin.
+
+    :param margin: Profit margin as decimal percentage (e.g. between
+       0.0 and 1.0).
+
+    :returns: Equivalent cost markup as decimal value (e.g. 1.4).
+    """
+    if margin is None:
+        return
+    if margin == 0:
+        return 1
+
+    return 1 / (1 - margin)