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Collection of a bunch of named stuff

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.

to python object dict bunch by korakot on Mar 22, 2006

An interval mapping class

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
>>>

to python dict interval mapping by korakot on Feb 15, 2006

Ordered dictionary

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

to python dict order by korakot on Nov 29, 2005

Default dictionary

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

to python default dict by korakot on Sep 14, 2005