Pythonic syntax for appending an arbitrary class object list property

Question

Is there an analog of setattr() that allows for appending an arbitrary list property of an instantiated class object? If not, is there a recommended way of doing so?

This is a trivialized version of what I'm doing currently:

foo = SomeClass()
...
attr = "names"
value = "Eric"
values = getattr(foo, attr)
values.append(value)
setattr(foo, attr, values)

This seems clunky and inefficient.

Edit: this assumes that foo.names (or whatever arbitrary value might be assigned to the attr variable) is in fact a list.

Alex Martelli · Accepted Answer · 2010-07-13 23:43:33Z

15

The setattr call is redundant, if foo.names is indeed a list (if it's something else, could you please clarify?). getattr(foo, attr).append(value) is all you need.

answered Jul 13, 2010 at 23:43

Alex Martelli

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