Thanks to everyone that has helped on this. What I am trying to do is create a capability based api that I can build to order. This is as far as I get at the moment.
Each of the first three classes represents some function I can do to a radio, there would be many of these in practice. The next class is the API. I figure I have to include all the possible radio function classes in this as I can't figure out how to make the classes I include per instance. When I create the API object I pass in a capability array as in the last class. I use these classes as follows.
>>> import capability as c
>>> import radioapi as r
>>> caps = c.Capability()
>>> cap = caps.getCaps('SDR1000')
>>> cap
['mode', 'freq', 'blanker']
>>> api = r.API(cap)
>>> r.caps
['mode', 'freq', 'blanker']
>>> api.mode
Retrieving mode var "mode"
'lsb'
>>> api.freq
Retrieving freq var "freq"
7.0800000000000001
>>> api.blanker
Retrieving blanker var "blanker"
1
>>> hasattr(api, 'monitor')
0
This is the behaviour I want, each class responds if it is in the capability array. The user can test attributes with hasattr(klass, 'att') to see if it is supported. I can create another instance with a different radio and it will respond accordingly. The problem of course is that in class API, caps is global so as soon as I create another instance the first starts responding to the new capability. If I try to make caps per instance I get into all sorts of trouble with recursion. Does anyone have an idea how to fix this or is it just impossible to make this work.
Regards
Bob
class Mode(object):
def __init__(self, initval=None, name='var'):
self.val = initval
self.name = name
def __get__(self, obj, objtype):
print 'Retrieving mode', self.name
return self.val
def __set__(self, obj, val):
print 'Updating mode' , self.name
self.val = val
import capability
class Freq(object):
def __init__(self, initval=None, name='var'):
self.val = initval
self.name = name
def __get__(self, obj, objtype):
print 'Retrieving freq', self.name
return self.val
def __set__(self, obj, val):
print 'Updating freq' , self.name
self.val = val
class Blanker(object):
def __init__(self, initval=None, name='var'):
self.val = initval
self.name = name
def __get__(self, obj, objtype):
print 'Retrieving blanker', self.name
return self.val
def __set__(self, obj, val):
print 'Updating blanker' , self.name
self.val = val
class API(object):
# create all possible radio classes
mode=Mode('lsb', 'var "mode"')
freq=Freq(7.080, 'var "freq"')
blanker=Blanker(True, 'var "blanker"')
global caps
caps = []
def __init__(self, pcaps):
global caps
caps = pcaps
def __getattribute__(self, key):
global caps
if (key in caps) or (key == 'caps'):
obj = object.__getattribute__(self, key)
if hasattr(obj, "__get__"):
return obj.__get__()
return obj
else:
raise AttributeError, "unreadable attribute"
class Capability(object):
m_cap = {
'SDR1000': ['mode','freq','blanker'],
'MyRig': ['mode','freq'],
'YourRig': ['mode', 'blanker']
}
def getCaps(self, radio):
return self.m_cap[radio]
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