DZone Snippets: dict code

Collection of a bunch of named stuff

korakot (Korakot Chaovavanich) — Wed, 22 Mar 2006 13:14:51 GMT

Taken from this recipe and its comments.



class bunch(dict):

    def __init__(self,**kw):

        dict.__init__(self,kw)

        self.__dict__.update(kw)

Usage is simple.



>>> o = bunch(a='A', b='B')

>>> o

{'a': 'A', 'b': 'B'}

>>> o.a

'A'

>>> o.b

'B'

>>>

You can use it as both an object and dict.

An interval mapping class

korakot (Korakot Chaovavanich) — Wed, 15 Feb 2006 21:11:21 GMT

A kind of dictionary which allows you to map data intervals to values.
Download 'intervalmap' from this recipe page.



>>> i = intervalmap()

>>> i[0:5] = '0-5'

>>> i[8:12] = '8-12'

>>> print i[2]

0-5

>>> print i[10]

8-12

>>>

Ordered dictionary

korakot (Korakot Chaovavanich) — Tue, 29 Nov 2005 12:42:29 GMT

This is part of the pythonutils package.



od = OrderedDict()

od['key1'] = 'value 1'

od['key2'] = 'value 2'

print od

{'key1': 'value 1', 'key2': 'value 2'}



print od.sequence

['key1', 'key2']

od.sequence.reverse()

print od

{'key2': 'value 2', 'key1': 'value 1'}

print od.sequence

['key2', 'key1']

This dict keeps its insertion order and you can do other
manipulations. See more details here

Default dictionary

korakot (Korakot Chaovavanich) — Thu, 15 Sep 2005 01:11:37 GMT

I always want to do this, like I did in Perl.



>> d = DefaultDict(0)

>> d[key] += 1     # no need to use d.get or d.setdefault



>> d = DefaultDict([])  # similarly with list value

>> d[key].append(item)

See the implementation by Peter Norvig (of AI & Google fame)
here