Question

List duplicate data concatenation in python

This is in continuation of list issue but here I want to preserve the order of the dict

listData=[('audioVerify', '091;0'), ('imageVerify', 'icon091.gif'), ('bufferVerify', '\x01?')]
    methodList = {}
for item in listData:
    methodList.setdefault(item[0],[]).append(item[1:])
for method in methodList:
    arguments = methodList[method]
    s = [method,arguments]
    print s

when I iterate the list it gives the following

  ['audioVerify', [('091;0',)]]
  ['bufferVerify', [('\x01?',)]]
  ['imageVerify', [('icon091.gif',)]]

but what are the possibilities where I can preserve the order as below:

  ['audioVerify', [('091;0',)]]
  ['imageVerify', [('icon091.gif',)]]
  ['bufferVerify', [('\x01?',)]]

Answer 1

I have just what the doctor ordered: OrderedDict

From the examples:

>>> from collections import OrderedDict
>>> # regular unsorted dictionary
>>> d = {'banana': 3, 'apple':4, 'pear': 1, 'orange': 2}

>>> # dictionary sorted by key
>>> OrderedDict(sorted(d.items(), key=lambda t: t[0]))
OrderedDict([('apple', 4), ('banana', 3), ('orange', 2), ('pear', 1)])

>>> # dictionary sorted by value
>>> OrderedDict(sorted(d.items(), key=lambda t: t[1]))
OrderedDict([('pear', 1), ('orange', 2), ('banana', 3), ('apple', 4)])

>>> # dictionary sorted by length of the key string
>>> OrderedDict(sorted(d.items(), key=lambda t: len(t[0])))
OrderedDict([('pear', 1), ('apple', 4), ('orange', 2), ('banana', 3)])

If you have an older versions of python, consult this other SO question.