On 2018-02-26 21:12, Rick Johnson wrote:
On Monday, February 26, 2018 at 8:44:14 AM UTC-6, Steven D'Aprano wrote:
I have a class with a large number of parameters (about
ten) assigned in `__init__`. The class then has a number of
methods which accept *optional* arguments with the same
names as the constructor/initialiser parameters. If those
arguments are None, the defaults are taken from the
instance attributes.
An example might be something like this:
class Foo:
def __init__(self, bashful, doc, dopey, grumpy,
happy, sleepy, sneezy):
self.bashful = bashful # etc
def spam(self, bashful=None, doc=None, dopey=None,
grumpy=None, happy=None, sleepy=None,
sneezy=None):
if bashful is None:
bashful = self.bashful
if doc is None:
doc = self.doc
if dopey is None:
dopey = self.dopey
if grumpy is None:
grumpy = self.grumpy
if happy is None:
happy = self.happy
if sleepy is None:
sleepy = self.sleepy
if sneezy is None:
sneezy = self.sneezy
# now do the real work...
def eggs(self, bashful=None, # etc...
):
if bashful is None:
bashful = self.bashful
# and so on
Steven... even if this example code is absolutely atrocious
(because it is!), and even *IF* i have a uneasy suspicion
that this "inquiry" masks some dastardly malicious plan
(because i do!), I must admit, I am happy to see that you
are _finally_ embracing the OOP paradigm.
For starters, I would suggest replacing those ugly if-
clauses with some short-circuit or'd-logic. But obviously
you need to run that "paragraph of arguments" through a
single helper function, as the point of "DRY" is "Don't
Repeat Yourself".
Before using or'd-logic, you need to know whether the value could be
falsey, e.g. 0.
</pesos count="2">
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