messages.py

def uniquify_ordered(seq, idfun=None):
    # Removes duplicates from a list and preserves the order of items
    # Taken from http://www.peterbe.com/plog/uniqifiers-benchmark
    if idfun is None:
        def idfun(x):
            return x
    seen = {}
    result = []
    for item in seq:
        marker = idfun(item)
        if marker in seen:
            continue
        seen[marker] = 1
        result.append(item)
    return result

Surely the idfun would be better as a default argument?

def uniquify_ordered(seq, idfun=lambda x: x):

Even better, from mattr:

>>> a = [1, 1, 5, 2, 3, 4, 3, 2, 1, 4, 5]
>>> from collections import OrderedDict
from collections import OrderedDict
>>> list(OrderedDict.fromkeys(a))
list(OrderedDict.fromkeys(a))
[1, 5, 2, 3, 4]
>>>