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Update logic for calculating markup from margin

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to assume margin value is between 0 - 100 by default, instead of
assuming it's between 0.0 - 1.0

part of a broader effort to standardize how we handle percentage values
This commit is contained in:
Lance Edgar 2022-10-28 19:30:50 -05:00
parent 8fb67c2ce2
commit b6803ce301
1 changed files with 29 additions and 4 deletions
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33
rattail/pricing.py
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@ -27,6 +27,7 @@ Pricing Utilities
from __future__ import unicode_literals, absolute_import
import decimal
import warnings
def gross_margin(price, cost, percentage=False):
@ -59,12 +60,19 @@ def gross_margin(price, cost, percentage=False):
return 100 * margin
def calculate_markup(margin):
def calculate_markup_from_margin(margin, from_decimal=False):
"""
Calculate the "markup" value corresponding to the given margin.
:param margin: Profit margin as decimal percentage (e.g. between
0.0 and 1.0).
This assumes the ``margin`` value is user-friendly, e.g. ``37.5``
instead of ``0.375`` to represent 37.5%, unless ``from_decimal``
is true in which case the decimal format is assumed.
:param margin: Profit margin percentage.
:param from_decimal: If false (the default), then ``margin``
should (normally) be between 0 - 100. But if true, then
``margin`` is assumed to be between 0.0 and 1.0 instead.
:returns: Equivalent cost markup as decimal value (e.g. 1.4).
"""
@ -73,7 +81,24 @@ def calculate_markup(margin):
if margin == 0:
return 1
return 1 / (1 - margin)
if from_decimal:
margin *= 100
return 100 / (100 - margin)
def calculate_markup_from_margin_decimal(margin):
warnings.warn("calculate_markup_from_margin_decimal() is deprecated; "
"please use calculate_markup_from_margin() instead",
DeprecationWarning, stacklevel=2)
return calculate_markup_from_margin(margin, from_decimal=True)
def calculate_markup(margin):
warnings.warn("calculate_markup() is deprecated; please use "
"calculate_markup_from_margin() instead",
DeprecationWarning, stacklevel=2)
return calculate_markup_from_margin(margin, from_decimal=True)
def calculate_variance(oldvalue, newvalue):