Python Chain getattr as a string

Question

import amara
def chain_attribute_call(obj, attlist):
    """
    Allows to execute chain attribute calls
    """
    splitted_attrs = attlist.split(".")
    current_dom = obj
    for attr in splitted_attrs:
        current_dom = getattr(current_dom, attr)
    return current_dom

doc = amara.parse("sample.xml")
print chain_attribute_call(doc, "X.Y.Z")

In oder to execute chain attribute calls for an object as a string, I had to develop the clumsy snippet above. I am curious if there would be a more clever / efficient solution to this.

score 30 · Answer 1 · answered Jul 19 '10 at 16:46

30

you could also use:

from operator import attrgetter
attrgetter('x.y.z')(doc)

answered Jul 19 '10 at 16:46

SilentGhost

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score 13 · Accepted Answer · edited May 23 '17 at 12:34

13

Just copying from Useful code which uses reduce() in Python:

from functools import reduce
reduce(getattr, "X.Y.Z".split('.'), doc)

edited May 23 '17 at 12:34

Community

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answered Jul 19 '10 at 07:24

kennytm

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Great snipplet! Sadly my server is debian lenny and runs with python 2.5 while reduce requires 2.6 :( – Hellnar Jul 19 '10 at 07:30
1

@hellinar: `reduce` is a built-in function in python2.5 – SilentGhost Jul 19 '10 at 07:31
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@Hellnar: Python 2.5 has `reduce`, except it is a built-in function instead of being in `functools`. – kennytm Jul 19 '10 at 07:32
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BTW, `reduce` is still a built-in function in Python 2.6 and 2.7 (it would be horrible to remove built-in functions without changing the major version number). Only the 3.x series has it in the `functools` module exclusively. – Philipp Jul 19 '10 at 07:48
Excellent solution! – FearlessFuture Sep 19 '21 at 03:40

Python Chain getattr as a string

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