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Date: Tue, 2 Jun 2015 23:42:31 +0300
Subject: Re: Please help on this sorted function
From: Joonas Liik <liik.joonas@gmail.com>
To: fl <rxjwg98@gmail.com>, Python <python-list@python.org>
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Xref: csiph.com comp.lang.python:91894

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my_dict = {1: 'D', 2: 'B', 3: 'A', 4: 'E', 5: 'B'}

# dict.items() returns an iterator that returns pairs of (key, value) pairs
# the key argument to sorted tells sorted what to sort by,
operator.itemgetter is a factory function , itemgetter(1)== lambda
iterable: iterable[1]
sorted_dict = sorted(my_dict.items(), key=itemgetter(1))

# at this moment sorted dict is a generator of key-value tuples in the
right order
sorted_dict = OrderedDict(sorted_dict) # turn the generator in to an actual
dict.

# notice: regular dicts are NOT ORDERED, you need a special type of dict to
preserve the order, hence OrderedDict

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<div dir=3D"ltr">my_dict =3D=C2=A0<span style=3D"font-size:12.8000001907349=
px">{1: &#39;D&#39;, 2: &#39;B&#39;, 3: &#39;A&#39;, 4: &#39;E&#39;, 5: &#3=
9;B&#39;}</span><div><span style=3D"font-size:12.8000001907349px"><br></spa=
n><div><span style=3D"font-size:12.8000001907349px"># dict.items() returns =
an iterator that returns pairs of (key, value) pairs</span></div><div><span=
 style=3D"font-size:12.8000001907349px"># the key argument to sorted tells =
sorted what to sort by, operator.itemgetter is a factory function ,=C2=A0</=
span><span style=3D"font-size:12.8000001907349px">itemgetter(1)=3D=3D lambd=
a iterable: iterable[1]</span><span style=3D"font-size:12.8000001907349px">=
<br></span><div><span style=3D"font-size:12.8000001907349px">sorted_dict =
=3D sorted(my_dict.items(), key=3Ditemgetter(1))</span></div></div><div><sp=
an style=3D"font-size:12.8000001907349px"><br></span></div><div><span style=
=3D"font-size:12.8000001907349px"># at this moment sorted dict is a generat=
or of key-value tuples in the right order</span></div><div><span style=3D"f=
ont-size:12.8000001907349px">sorted_dict =3D OrderedDict(</span><span style=
=3D"font-size:12.8000001907349px">sorted_dict</span><span style=3D"font-siz=
e:12.8000001907349px">) # turn the generator in to an actual dict.</span></=
div><div><span style=3D"font-size:12.8000001907349px"><br></span></div><div=
><span style=3D"font-size:12.8000001907349px"># notice: regular dicts are N=
OT ORDERED, you need a special type of dict to preserve the order, hence Or=
deredDict</span></div><div><span style=3D"font-size:12.8000001907349px"><br=
></span></div><div><span style=3D"font-size:12.8000001907349px"><br></span>=
</div><div class=3D"gmail_extra"><br></div></div></div>

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