Python string to attribute

Question

How can I achieve such job:

def get_foo(someobject, foostring):
    return someobject.foostring

IE:

if I do get_foo(obj, "name") it should be calling obj.name (see input as string but I call it as an attritube.

Thanks

possible duplicate of [Dynamically calling functions - Python](http://stackoverflow.com/questions/2818490/dynamically-calling-functions-python) — SilentGhost, Jul 15 '10 at 09:05
Possible duplicate of [How to access object attribute given string corresponding to name of that attribute](http://stackoverflow.com/questions/2612610/how-to-access-object-attribute-given-string-corresponding-to-name-of-that-attrib) — Fabian Rost, Nov 21 '15 at 15:48

score 121 · Accepted Answer · edited Jun 29 '18 at 05:25

121

Use the builtin function getattr.

getattr(object, name[, default])

Return the value of the named attribute of object. name must be a string. If the string is the name of one of the object’s attributes, the result is the value of that attribute. For example, getattr(x, 'foobar') is equivalent to x.foobar. If the named attribute does not exist, default is returned if provided, otherwise AttributeError is raised.

edited Jun 29 '18 at 05:25

David P

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answered Jul 15 '10 at 09:00

adamk

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that's a huge blessing that we can do that =) – Prof. Shanku Aug 21 '21 at 06:50

score 52 · Answer 2 · edited Jul 03 '15 at 08:20

52

If someobject has an attribute named foostring then

def get_foo(someobject, foostring):
    return getattr(someobject,foostring)

or if you want to set an attribute to the supplied object then:

def set_foo(someobject, foostring, value):
    return setattr(someobject,foostring, value)

Try it

edited Jul 03 '15 at 08:20

Christopher Pearson

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answered Jul 15 '10 at 09:23

Nazmul Hasan

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score 36 · Answer 3 · answered Jul 15 '10 at 08:59

36

You should use setattr and getattr:

setattr(object,'property',value)
getattr(object,'property',default)

answered Jul 15 '10 at 08:59

Frost.baka

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Python string to attribute

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