Feeding differeent data types to a class instance?

Steve Holden steve at holdenweb.com
Sun Mar 14 14:03:53 CET 2010


kuru wrote:
> Hi
> 
> I have couple classes in the form of
> 
> class Vector:
>   def __init__(self,x,y,z):
>    self.x=x
>    self.y=y
>    self.z=z
> 
> This works fine for me. However I want to be able to provide a list,
> tuple as well as individual arguments like below
> 
> myvec=Vector(1,2,3)
> 
> This works well
> 
> 
> However I  also want to be able to do
> 
> vect=[1,2,3]
> 
> myvec=Vec(vect)
> 
> I want this class to accept multiple data types but process them as
> they are same when the classs deals with the instances.
> 
> thanks
> 
> 
With your existing class you can use Python's ability to transform a
list or tuple into individual arguments using the * notation:

>>> class Vector:
...   def __init__(self,x,y,z):
...    self.x=x
...    self.y=y
...    self.z=z
...
>>> vl = [1, 2, 3]
>>> v = Vector(*vl)
>>> v.x
1
>>> v.y
2
>>> v.z
3
>>>

Will this do? It seems much simpler than rewriting an already
satisfactory class.

regards
 Steve
-- 
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