Python: How to get object attribute attribute with getattr?

Question

How to rate

a = myobject.id.number

and return None if it is myobject equal None

with built-in getattr? Maybe getattr(myobject, "id.number", None)?

+5

alwbtc Feb 17 '13 at 19:39

5 answers

This should scale well to any depth:

reduce(lambda obj, attr : getattr(obj, attr, None), ("id","num"), myobject)

+5

Storyteller Feb 17 '13 at 20:58

Here is a single line

a = myobject is not None and myobject.id.number or None

It does not check if id is None, but that was not part of the original question.

+1

tdelaney Feb 17 '13 at 20:53

A little bit over a general solution preserving all members:

if myobject and myobject.id and myobject.id.number:
    a = myobject.id.number
else:
    a = None

0

sharjeel Feb 17 '13 at 19:51

return myobject.id.number if myobject else None

0

Hyperboreus Feb 17 '13 at 20:57

sidi · Accepted Answer · 2013-02-17T19:51:38+0000

getattr(getattr(myobject, "id", None), "number", None)

must work.