Stef Mientki a écrit :
> In the example below, "pin" is an object with a number of properties.
> Now I want
> 1- an easy way to create objects that contains a number of these "pin"
> 2- an multiple way to access these "pin", i.e.
> device.pin[some_index]
> device.some_logical_name
> ad 1:
> a dictionary (as "pinlist" in the example) seems a very convenient
> way (from a viewpoint of the device creator).
> As you can see in the "__init__" section this dictionary can easily be
> transported to the pin-objects.
>
> ad 2:
> THAT's the problem: how do automate these lines "self.GND = self.pin[0]"
>
> I'm also in for other solutions.
I'm afraid I don't understand your design (nor the domain FWIW). A few
comments anyway:
>
> class Power_Supply(device):
Please reread my comments about naming convention in a previous thread...
> pinlist = {
This is *not* a list, so naming it 'pinlist' is misleading. Also, why is
this defined here ?
> 0: ('GND', _DIG_OUT, _par2),
> 1: ('VCC', _DIG_OUT, _par33)
> }
>
> def __init__(self):
> # store pin-names and pin-parameters in pins
> for k in self.pinlist.keys():
> self.pin[k].Name = self.pinlist[k][0]
What is 'self.pin' ? Where is it defined ? (NB : please try to post
*runnable* code).
And FWIW, if it's a container, why is it named 'pin', and not 'pins' ?
> self.pin[k].Value = self.pinlist[k][2]
The appropriate way to use the for loop here is:
for k, v in self.pinlist.items():
self.pin[k].name = v[0]
# etc
> # for some pins, we also want to be able to use logical names
> # HOW TO USE SOMETHING like
> # "self.pinlist[0] = self.pin[0]"
> # INSTEAD OF
> self.GND = self.pin[0]
> self.VCC = self.pin[1]
you can build a 'reversed index':
# store pin-names and pin-parameters in pins
for k, v in self.pinlist.items():
self.pin[k].name = v[0]
self.pin[k].value = v[2]
self.reversed_index[v[0]] = self.pin[k]
and then use the __getattr__ hook:
def __getattr__(self, name):
return self.reversed_index[name]
But the whole thing still looks awfully convulted and kludgy to me, and
I suspect serious design flaws... Why don't you try and explain your
real problem, instead of asking how to implement what you *think* is the
solution ?
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