tinn...@isbd.co.uk wrote:
> I want to sort a list of 'things' (they're fairly complex objects) by
> the contents of one of the fields I can extract from the 'things'
> using a Python function.
>
> So I have a list L which is a list of objects of some sort. I can
> output the contents of a field in the list as follows:-
>
> for k in L:
> print k.get_property('family-name')
>
> How can I sort the list first? As I said it seems like a methodcaller
> is the answer but I don't see how. I want to sort the list of objects
> not just produce a sorted list of names.
The most obvious way is to use a custom function
def get_family_name(obj):
return obj.get_property("family-name")
L.sort(key=get_family_name)
However, since you already know about methodcaller
"""
class methodcaller(builtins.object)
| methodcaller(name, ...) --> methodcaller object
|
| Return a callable object that calls the given method on its operand.
| After, f = methodcaller('name'), the call f(r) returns r.name().
| After, g = methodcaller('name', 'date', foo=1), the call g(r) returns
| r.name('date', foo=1).
""""
L.sort(key=methodcaller("get_property", "family-name"))
--
http://mail.python.org/mailman/listinfo/python-list
