Hi Andrew.
You start by talking about a data structure, then show code that uses
"class". Not everything in Python needs to be in a class.
I'd look at using a simple Dictionary of lists, indexed on your ID. A list
can contain anything, so you can add your objects in there dynamically as
needed. If you need to refer to the objects by name, use a dictionary of
dictionaries.
Examples:
# Dict of lists.
>>> my_objects = {}
>>> my_objects['id1'] = []
>>> my_objects
{'id1': []}
>>> my_objects['id2'] = []
>>> my_objects
{'id1': [], 'id2': []}
>>> my_objects['id3'] = []
>>> my_objects
{'id1': [], 'id2': [], 'id3': []}
>>> my_objects['id2'].append('some data, but could be anything')
>>> my_objects
{'id1': [], 'id2': ['some data, but could be anything'], 'id3': []}
>>> my_objects['id2'][0]
'some data, but could be anything'
# Dict of dicts.
>>> my_objects2 = {}
>>> my_objects2['id1'] = {}
>>> my_objects2['id2'] = {}
>>> my_objects2['id3'] = {}
>>> my_objects2
{'id1': {}, 'id2': {}, 'id3': {}}
>>> my_objects2['id2']['new_key'] = 'some data, but could be anything'
>>> my_objects2
{'id1': {}, 'id2': {'new_key': 'some data, but could be anything'}, 'id3':
{}}
>>> my_objects2['id2']['new_key']
'some data, but could be anything'
I think if you concentrate on manipulating your data as opposed to trying
to write code which manipulates it, you might be better off.
I hope this helps.
Regards.
Paul.
On 15 June 2017 at 02:36, Andrew Zyman <form...@gmail.com> wrote:
> Hello,
> i wonder what would be a proper data structure for something with the
> following characteristics:
>
> id - number,
> obj[a..c] - objects of various classes
>
> the idea is to be able to update certain fields of these objects initially
> getting access to the record by ID
>
> something like this ( not working )
>
> ### code start
>
> class ClassA(object):
> a = ''
> b = ''
> def __init__(self):
> a= 'aa'
> b= 'ab'
>
> class ClassB(object):
> def __init__(self):
> self.c = 'ba'
> self.d = 'bb'
>
> def main():
> obja = ClassA
> objb = ClassB
>
> sets = set(obja, objb)
> contracts[1] = sets
>
> print('Sets ', contracts)
>
> # with the logic like ( not working too)
> if obja.a = 'aa':
> contracts[1].obja.a = 'ABC'
>
>
> if __name__ == '__main__':
> main()
>
>
> ### code end
>
> appreciate your guidance
> --
> https://mail.python.org/mailman/listinfo/python-list
>
--
Paul Barry, t: @barrypj <https://twitter.com/barrypj> - w:
http://paulbarry.itcarlow.ie - e: paul.ba...@itcarlow.ie
Lecturer, Computer Networking: Institute of Technology, Carlow, Ireland.
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