Serhiy Storchaka added the comment:
Here is a functional (and more effective) equivalent of attrgetter:
def attrgetter(attr, *attrs):
"""
Return a callable object that fetches the given attribute(s) from its
operand.
After f=attrgetter('name'), the call f(r) returns r.name.
After g=attrgetter('name', 'date'), the call g(r) returns (r.name, r.date).
After h=attrgetter('name.first', 'name.last'), the call h(r) returns
(r.name.first, r.name.last).
"""
if not attrs:
if not isinstance(attr, str):
raise TypeError('attribute name must be a string')
names = attr.split('.')
def func(obj):
for name in names:
obj = getattr(obj, name)
return obj
return func
else:
getters = tuple(map(attrgetter, (attr,) + attrs))
def func(obj):
return tuple(getter(obj) for getter in getters)
return func
----------
nosy: +serhiy.storchaka
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<http://bugs.python.org/issue16694>
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