Creating Sub-Objects in Python

Question

I need to create an object and define another object's property with that object.

For example, create a class called Income. Then with an Income object, define in a class called taxReturn an attribute called Income.

That way, it'd be possible to access elements of a business's income by doing the following: taxReturn.Income.sal_wge. So far I have this:

class taxReturn:

    def __init__(self, income = None):

        income = income or ['sal_wge', 'intr_rec', 'txexem_intinc', 'divid_AGI', 'qual_divid', 'stinc_txref', 'alimony_rec', 
                 'bus_netprof', 'net_capgain', 'capgain_dist', 'othr_gain', 'IRA_dist', 'pens_annu_rec', 'pens_annu_AGI', 
                 'sch_E_netinc', 'sch_F_netprof', 'unem_comp', 'soc_sec']

        self.income = 'income'

class Income:
   def ('income'):

How do I create a sub object that becomes an attribute to the larger object? — Alex Durante, Oct 07 '15 at 13:39
Same way as any other attribute. Where specifically are you having problems? — Daniel Roseman, Oct 07 '15 at 13:39
Alex, Would you spend a minute in drawing a class as rectangle and put the members in it? A simple picture or ASCII art will help us though. — nehem, Oct 07 '15 at 13:41
you can have a class as an attribute of another class, same way you can have any variable as an attribute — scrineym, Oct 07 '15 at 13:41
No of course not, that's not valid Python syntax. But I thought your question was about how to make Income an attribute of Taxreturn, not how to define Income. — Daniel Roseman, Oct 07 '15 at 13:45
Sorry, I made the intended update in the above window. Yes, that was my question. — Alex Durante, Oct 07 '15 at 13:48

skyking · Answer 1 · 2015-10-07T13:45:38.530

3

There seem to be some code left out in your example, but it's quiet straight forward to create sub-objects, you just instantiate them and assign to a member. Something like:

class Income:
    def __init__(self, sal_wge):
         self.sal_wge = sal_wge

class TaxReturn:
    def __init__(self, income = None):
         self.income = income or Income(sal_wge = 0)

t = TaxReturn()

print(t.income.sal_wge)

edited Oct 07 '15 at 13:45

answered Oct 07 '15 at 13:41

skyking

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That was very helpful. Thank you. – Alex Durante Oct 07 '15 at 13:45
I have a question though. I want income to be the sub object of TaxReturn. Don't you have it the other way around in this example? @skyking – Alex Durante Oct 07 '15 at 13:51

Creating Sub-Objects in Python

1 Answers1