c to python

[Jimmy verma]

What if we have a statement like
#define ABC 0x0001 in my c struct.
I m writing like this in python.

class AB:
       def __init__(self):
                 self.a = None
                 self.b = None
                 #statement here ?







>From: Gerald Klix <Gerald.Klix at klix.ch>
>To: python-list at python.org
>Subject: Re: c to python
>Date: Mon, 26 May 2003 21:45:58 +0200
>
>Thats easy if you want your structure's members to be initialized on 
>creation (with None)
>
>class ab:
>  def __init__( self ):
>   self.a = None
>   self.b = None
>   self.c = None
>   self.d = None
>
>or shorter
>
>  self.a = self.b = self.c = self.d = None
>
>If you don't care about initialisation.
>You can just define a class called MyStructureSurrogate
>and create instances as you like.
>
>class MyStructureSurrogate:
>  pass
>
>si = MyStructureSurrogate()
>si.a = 1
>si.b = 4711
>si.d = MyStructureSurrogate()
>si.d.a = 2
>
>and so on
>
>Because python has strict referrence semantics a actually get something
>like this:
>
>struct ab
>{
>       int *a;
>       int *b;
>       int *c;
>       struct d *d;
>} AB;
>
>with pointers automaticly dereferenced.
>
>HTH to start with python,
>Gerald
>
>
>Jimmy verma wrote:
>>Thanks for responding. I dont want the python extension for my C code as i 
>>have quite a big program in C.  I will prefer to write my program from 
>>scratch in python. I will be thankful if you can tell me how can i write 
>>an  equivalent code in python for this sort of example i have mentioned.
>>
>>
>>Your link will be helpfull for me while writing my program in python. 
>>Thanks for that.
>>
>>Waiting for your response.
>>
>>Regards,
>>
>>
>>    From: Gerhard Häring <gh at ghaering.de>
>>To: python-list at python.org
>>Subject: Re: c to python
>>Date: Mon, 26 May 2003 20:22:57 +0200
>>
>>Jimmy verma wrote:
>>    Hi !
>>
>>I have a structure in c like this
>>
>>struct ab
>>{
>>       int a;
>>       int b;
>>       int *c;
>>      struct d *d;
>>} AB;
>>
>>
>>And i am using it in my program like
>>
>>void XYZ(int a , AB *b)
>>
>>How can this kind of structure be translated in python code?
>>
>>As far as I see, you can't. Python doesn't know about pointers, even with 
>>the struct module (http://python.org/doc/current/lib/module-struct.html).
>>
>>    Your suggestions are welcomed.
>>
>>It might be that you'll have to write a C extension to wrap your existing 
>>C code for use with Python.
>>
>>If, however, you don't need any binary compatibility of your existing C 
>>code and you simply want an equivalent data structure in Python, then 
>>that's certainly easily doable.
>>
>>We'd need to know why you have the 'int* c' in your C struct declaration, 
>>then.
>>
>>-- Gerhard
>>
>>
>>--
>>http://mail.python.org/mailman/listinfo/python-list
>>
>>_________________________________________________________________
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>>
>>
>
>--
>http://mail.python.org/mailman/listinfo/python-list

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