At Friday 10/11/2006 14:11, Alan G Isaac wrote:
My class MyClass reuses many default parameters
with a small number of changes in each instance.
For various reasons I decided to put all the
parameters in a separate Params class, instances
of which reset the default values based on keyword
arguments, like this:
class Params:
def __init__(self,**kwargs):
#set lots of default values
...
#set the deviations from defaults
self.__dict__.update(kwargs)
Is this a reasonable approach overall?
(Including the last line.)
I'm not sure what you want to do exactly, but a class attribute acts
as a default instance attribute.
class A(object):
x = 0
y = 20
def __init__(self, x=None, y=None):
if x is not None: self.x = x
if y is not None: self.y = y
class B(A):
z = 3
def __init__(self, x=None, y=None, z=None):
A.__init__(self, x, y)
if z is not None: self.z = z
a = A(1)
print "a.x=",a.x
print "a.y=",a.y
b = B(z=8)
print "b.x=",b.x
print "b.y=",b.y
print "b.z=",b.z
output:
a.x= 1
a.y= 20
b.x= 0
b.y= 20
b.z= 8
--
Gabriel Genellina
Softlab SRL
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