Create object with attributes that have default values Python

Question

I need create an object with attributes that have default values. This object would eventually be populated with tax data. Here is a sample of what I have so far:

class taxReturn:

def __init__(self, 
             income = ['E00200', 'E00300', 'E00400', 'E00600', 'E00650', 'E00700', 'E00800', 'E00900', 'E01000', 'E01100', 'E01200', 'E01400', 'E01500', 'E01700', 'E02000', 'E02100', 'E02300', 'E02400', 'E02500'],
             stat_adj = ['E03150', 'E03210', 'E03220', 'E03230', 'E03260', 'E03270', 'E03240', 'E03290', 'E03300', 'E03400', 'E03500'],
             AGI = 'E00100'

             self.income = income
             self.stat_adj = stat_adj
             self.AGI = AGI

I'm not sure what I can enter to produce default values, or if this form is sufficient to be populated with data.

What language is this?

entitycs
– entitycs

2015-10-04 22:47:37 +00:00
Commented Oct 4, 2015 at 22:47 — entitycs
– entitycs, Commented Oct 4, 2015 at 22:47
This language is Python

Alex Durante
– Alex Durante

2015-10-04 22:49:02 +00:00
Commented Oct 4, 2015 at 22:49 — Alex Durante
– Alex Durante, Commented Oct 4, 2015 at 22:49

BlivetWidget · Accepted Answer · 2015-10-04 22:59:49Z

3

You set default values for classes the same as you would for any other function in Python.

class Foo:
    def __init__(self, a=None, b=5):
        a = a or [1, 2, 3]
        self.a = a
        self.b = b

So when you use it you get:

>>> f = Foo()
>>> f.a
[1, 2, 3]
>>> f.b
5

By the way, never use mutables in your function header. They will not behave as you expect. Use None as shown above.

answered Oct 4, 2015 at 22:59

BlivetWidget

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2 Comments

Alex Durante Over a year ago

Great thanks. So will someone with tax data be able to take this code and then populate those default values with actual data?

BlivetWidget Over a year ago

Yes, please play with the above code to get a feeling for how Python classes work. You can access the class members with dot notation per the usual method for any other object. f.a = [5, 4, 3, 2] will change all its values. Then you could do f.a[0] = 0 and you'll get [0, 4, 3, 2] etc.

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