>>> from compose import Int, IG, Sum, Map, Dict, List

>>> # f = lambda x: int(x['item']['id'])
>>> f = Int << IG('item.id')
>>> f
<Compose: int,IG(id),IG(item)>
>>> f({'item': {'id': '75', 'v': 1}})
75

>>> # f = lambda x: list(map(int, x))
>>> f = List << Map(int)
>>> f
<Compose: list,map(int)>
>>> f('653')
[6, 5, 3]

>>> # f = lambda x: int(x['item']['id'])
>>> f = Sum << Map(int)
>>> f
<Compose: sum,map(int)>
>>> f('471')
12

>>> # f = lambda x: sum(map(int, x['item']['id'][1]))
>>> f = Sum << Map(int) << IG(1) << IG('item.x')
>>> f
<Compose: sum,map(int),IG(1),IG(x),IG(item)>
>>> f({'item': {'x': ['742', '153', '98'], 'f': 7}})
9

>>> # f = lambda x: dict(map(itemgetter(0, 2), x))
>>> # f = lambda x: {i[0]: i[2] for i in x}
>>> f = Dict << Map(IG(0, 2))
>>> f
<Compose: dict,map(IG(0,2))>
>>> f([('a', 17, 71), ('b', 26, 62), ('c', 39, 93)])
{'a': 71, 'b': 62, 'c': 93}

>>> from compose import Compose

>>> f = Compose(List, Map(int), Str)
# instead of f = List << Map(int) << Str
>>> f
<Compose: list,map(int),str>
>>> f(763)
[7, 6, 3]