Stef Mientki a écrit :
> hi Bruno,
>
> after study it carefully,
> it's much more complex than I thought
> (I can't understand it completely, which is of less importance).
> Your solution works great,
> but I need one little extension,
> which I can create, but just at the cost of a lot of code.
> Maybe you can give me another hint.
>
>> In the first case, this is *really* a binding, and that's one of the few
>> things that Python won't let you mess with. In the two last cases, it's
>> in fact a method call - as the use of __[get|set]item__ should make
>> obvious.
>>
>> here's an example using a property:
>>
>> class cpu_ports(object):
>> def __init__(self, value=0):
>> self._d = value
>> @apply
>> def value():
>> def fset(self, value):
>> print 'vv'
>> self._d = value
>> def fget(self):
>> return self._d
>> return property(**locals())
>
> # I need to read and write the individual bits of the byte object
> # so I can create 8 blocks of code like this, one for each bit position
> # I use it, like this
> # name1 = cpu_ports()
> # name1.p5 = True
> # or
> # name1.p[5] = True
>
> @apply # read / write bit 5
> def p5():
> def fset(self, value):
> index = 5
> value = ( value & 1L ) << index
> mask = ( 1L ) << index
> self._d = ( self._d & ~mask ) | value
> def fget(self):
> index = 5
> return ( self._d >> index ) & 1
> return property(**locals())
>
> I can optimize the above code a little bit,
> but I've the feeling that I don't need to repeat this code 8 times.
something like that should just work (untested) :
def bit():
def fset(self, value):
index = 5
value = ( value & 1L ) << index
mask = ( 1L ) << index
self._d = ( self._d & ~mask ) | value
def fget(self):
index = 5
return ( self._d >> index ) & 1
return property(**locals())
class cpu_ports(object) :
p1 = bit()
p2 = bit()
p3 = bit()
p4 = bit()
p5 = bit()
But i wonder if you shouldn't use arrays instead :
In [6]:import array
In [7]:help(array)
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