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Add percentage kwarg to pricing.gross_margin() function

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so it can return the "industry standard" value instead
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Lance Edgar 2019-03-08 14:02:13 -06:00
parent 9afdb7419a
commit 6ca0e9ca3c
1 changed files with 18 additions and 7 deletions
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25
rattail/pricing.py
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@ -1,8 +1,8 @@
# -*- coding: utf-8 -*- # -*- coding: utf-8; -*-
################################################################################ ################################################################################
# #
# Rattail -- Retail Software Framework # Rattail -- Retail Software Framework
# Copyright © 2010-2017 Lance Edgar # Copyright © 2010-2019 Lance Edgar
# #
# This file is part of Rattail. # This file is part of Rattail.
# #
@ -24,26 +24,37 @@
Pricing Utilities Pricing Utilities
""" """
from __future__ import unicode_literals from __future__ import unicode_literals, absolute_import
__all__ = ['gross_margin'] __all__ = ['gross_margin']
def gross_margin(price, cost): def gross_margin(price, cost, percentage=False):
""" """
Calculate and return a gross margin percentage based on ``price`` and Calculate and return a gross margin percentage based on ``price`` and
``cost``. ``cost``.
Please note, that for historical reasons, the default behavior is to return
the margin as a decimal value from 0.0 through 100.0 (or beyond, perhaps).
However the "industry standard" seems to be to use a decimal value between
0.000 and 1.000 instead. Specify ``percentage=True`` for this behavior.
If ``price`` is empty (or zero), returns ``None``. If ``price`` is empty (or zero), returns ``None``.
If ``cost`` is empty (or zero), returns ``100``. If ``cost`` is empty (or zero), returns ``100`` (or ``1`` if
``percentage=True``).
""" """
if not price: if not price:
return None return None
if not cost: if not cost:
if percentage:
return 1
return 100 return 100
return 100 * (price - cost) / price margin = (price - cost) / price
if percentage:
return margin
return 100 * margin