homepage

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