Python methods on an object - which is better?

Hopefully an easy question. If I have an object and I want to call a method on it which is the better approach, A or B?

class foo(object):
    def bar():
        print 'bar'

# approach A
f开发者_运维知识库 = foo()
f.bar()

# approach B
foo().bar()

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If your sole intent is to call bar() on a foo object, B is okay.

But if you actually plan to do something with the object later, you must go with A as B doesn't leave you any references to the created object.

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A is more readable.

So, A :)

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Approach B doesn't keep the object around. If method bar() returns self then you can write:

f = foo().bar()

Personally I like method A. Though I've started making setter functions that return self in order to chain them together like above - I don't think other people consider that pythonic.