# -*- coding: utf-8 -*-

from functools import singledispatch

def getvalue(value, path, default=None):

"""Get a named attribute or item from an object; getvalue(x, 'y.z')

is equivalent to x.y.z

When a default argument is given, it is returned when the attribute doesn't

exist; without it, None returned

List indexing supported x.0.y.1.z etc.

"""

paths = path.split(".")

return get_nested(value, *paths, default=default)

@singledispatch

def get_nested(value, path, *paths, default=None):

value = getattr(value, path, default)

if paths:

return get_nested(value, *paths, default=default)

return value

@get_nested.register(dict)

def get_nested_dict(value, path, *paths, default=None):

value = value.get(path, default)

if paths:

return get_nested(value, *paths, default=default)

return value

@get_nested.register(list)

@get_nested.register(tuple)

def get_nested_list(value, path, *paths, default=None):

try:

value = value[int(path)]

except IndexError:

value = default

if paths:

return get_nested(value, *paths, default=default)

return value