King wrote:
class MyFloat(object):
def __init__(self, value=0.):
self.value = value
def set(self, value):
self.value = value
def get(self):
return self.value
class MyColor(object):
def __init__(self, value=(0,0,0)):
self.value = (MyFloat(value[0]),
MyFloat(value[1]),
MyFloat(value[2]))
def set(self, value):
self.value[0].set(value[0])
self.value[1].set(value[1])
self.value[2].set(value[2])
def get(self):
return (self.value[0].get(),
self.value[1].get(),
self.value[2].get())
col = MyColor()
col[0].set(0.5) # 'MyColor' object does not support indexing
col[0] = 0.5 # 'MyColor' object does not support item assignment
King, I think you might be trying too hard. (Since I don't know your
"big picture", my suspicion might be wrong.) Python does not *require*
you to implement "get" and "set" methods in user-defined classes. More
detail ...
* You might not need the MyFloat class at all. Try using a plain old
Python "float" value.
* You don't need the "set" and "get" methods in the MyColor class. So
this might suffice:
class MyColor(object):
def __init__(self, value=(0.,0.,0.)):
self.value = list(value)
It's important for self.value to be a *list* object only if you want
modify individual components of a MyColor instance. If you *do* want to
modify individual components, then it *does* make sense to implement
"set" and "get" methods:
def set_comp(self, index, comp_value):
self.value[index] = comp_value
def get_comp(self, index):
return self.value[index]
For debugging, it makes senses to implement a __str__ or __repr__
method, so that "print" produces useful output:
def __str__(self):
return "MyColor: %3.1f %3.1f %3.1f" % tuple(self.value)
Putting it all together ...
#-----------------
class MyColor(object):
def __init__(self, value=(0.,0.,0.)):
self.value = list(value)
def __str__(self):
return "MyColor: %3.1f %3.1f %3.1f" % tuple(self.value)
def set_comp(self, index, comp_value):
self.value[index] = comp_value
def get_comp(self, index):
return self.value[index]
col = MyColor()
print col # output: MyColor: 0.0 0.0 0.0
col.set_comp(0, 0.5)
print col # MyColor: 0.5 0.0 0.0
col.set_comp(2, 0.7)
print col # MyColor: 0.5 0.0 0.7
col = MyColor((0.2, 0.3, 0.4))
print col # MyColor: 0.2 0.3 0.4
#-----------------
-John
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