Python init and Objects

Question

I have this issue. I wouldn't know if there is any short-cut to it but I would love a short-cut though.

Say I have this class

class a(object):
    def __init__(self, x, y):
        self.x = x
        self.y = y

    def __repr__(self):
        return "<a(%s', '%s')>" % (self.x, self.y)

    def b(self):
        print('First Name:', self.x, '\nLast Name:', self.y)


user = a('Ade', 'Shola')

Assuming there is only the first name,

user = a('Ade')

Can't I still run the script with some 'tweaks'?

This belongs on StackOverflow.

Job
– Job

2011-03-24 18:55:47 +00:00
Commented Mar 24, 2011 at 18:55 — Job
– Job, Commented Mar 24, 2011 at 18:55

Daenyth · Accepted Answer · 2011-03-24 21:46:16Z

5

Just set a null default value for the last parameter:

def __init__(self, x, y=None):

You'll need to check for y is None in a lot of your logic.

edited Mar 24, 2011 at 21:46

Daenyth

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answered Mar 24, 2011 at 18:54

chrisaycock

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2 Comments

Mark Nenadov Over a year ago

This is a good answer. I'd just add that if there's a default value for the y parameter when it isn't supplied you can do a: y = 'Doe', for instance. In this case it might make sense to put y = '', then it doesn't break your code and just leaves the missing argument blank when it is inserted into strings for display.

Daenyth Over a year ago

I edited your post to follow pep8 style and fix a bug -- use is None instead of == None.

nmichaels · Accepted Answer · 2011-03-25 16:32:34Z

1

You can also try this so set value of any field that you want...

>>> class a(object):
    def __init__(self, x=None, y=None):
        self.x = x
        self.y = y

    def __repr__(self):
        return "[a(%s', '%s')]" % (self.x, self.y)

    def b(self):
        print('First Name:', self.x, '\nLast Name:', self.y)

>>> user=a('nsn')
>>> user
[a (nsn', 'None')[
>>> user=a(x='xyx')
>>> user
[a(xyx', 'None')]
>>> user=a(y='abc')
>>> user
[a(None', 'abc')]
>>>

edited Mar 25, 2011 at 16:32

nmichaels

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answered Mar 25, 2011 at 5:55

Nilesh Nikumbh

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1 Comment

nmichaels Over a year ago

Welcome to Stack Overflow! For the future, you don't have to try so hard to get your formatting right. Just hilight the code and click the {} button. Or indent anything that's code by 4 spaces.

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