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python Programming Glossary: itertools.groupbyfind length of sequences of identical values in a numpy array http://stackoverflow.com/questions/1066758/find-length-of-sequences-of-identical-values-in-a-numpy-array this one of course def runs_of_ones bits for bit group in itertools.groupby bits if bit yield sum group If you do need the values in a list.. still def runs_of_ones_list bits return sum g for b g in itertools.groupby bits if b Moving to numpy native possibilities what about def..
Grouping dates in Django [duplicate] http://stackoverflow.com/questions/1236865/grouping-dates-in-django python django django forms share improve this question itertools.groupby is your dear dear friend import itertools dates 1 '2009 01 01.. 01 03 12 20 19' 5 '2009 01 03 13 01 06' for key group in itertools.groupby dates key lambda x x 1 11 print key for element in group print..
http://stackoverflow.com/questions/13211533/count-letter-and-show-in-list 1 'a' 5 'b' 1 python share improve this question Use itertools.groupby here from itertools import groupby k len list g for k g in groupby..
Python most common element in a list http://stackoverflow.com/questions/1518522/python-most-common-element-in-a-list an obvious one for non hashable but comparable elements itertools.groupby 1 . itertools offers fast reusable functionality and lets you.. sorted x i for i x in enumerate L # print 'SL ' SL groups itertools.groupby SL key operator.itemgetter 0 # auxiliary function to get quality.. issues in time and space e.g.... def most_common L groups itertools.groupby sorted L def _auxfun item iterable return len list iterable..
Python: removing duplicates from a list of lists http://stackoverflow.com/questions/2213923/python-removing-duplicates-from-a-list-of-lists for i in xrange N k sorted k dedup list k for k _ in itertools.groupby k with Timer 'loop in' for i in xrange N new_k for elem in k.. 4 5 6 2 1 2 3 4 import itertools k.sort list k for k _ in itertools.groupby k 1 2 3 4 5 6 2 itertools often offers the fastest and most.. i 0 or ks i ks i 1 def dogroupby k sorted sorted groupby itertools.groupby list list ks sorted k return i for i _ in itertools.groupby..
Use cases for the 'setdefault' dict method http://stackoverflow.com/questions/3483520/use-cases-for-the-setdefault-dict-method common use case Grouping items in unsorted data else use itertools.groupby # really verbose new for key value in data if key in new new..
http://stackoverflow.com/questions/3749512/python-group-by '11013331' '9843236' 'type' 'KAT' It is also possible with itertools.groupby but it requires the input to be sorted first. sorted_input sorted..
converting a list of integers into range in python http://stackoverflow.com/questions/4628333/converting-a-list-of-integers-into-range-in-python list range integer share improve this question Using itertools.groupby produces a concise but tricky implementation import itertools.. implementation import itertools def ranges i for a b in itertools.groupby enumerate i lambda x y y x b list b yield b 0 1 b 1 1 print..
How do I use Python's itertools.groupby()? http://stackoverflow.com/questions/773/how-do-i-use-pythons-itertools-groupby do I use Python's itertools.groupby I haven't been able to find an understandable explanation of.. understandable explanation of how to actually use Python's itertools.groupby function. What I'm trying to do is this Take a list in this.. them beyond a simple list of numbers. So how do I use of itertools.groupby Is there another technique I should be using Pointers to good..
Joining a set of ordered-integer yielding Python iterators http://stackoverflow.com/questions/969709/joining-a-set-of-ordered-integer-yielding-python-iterators import heapq itertools def intersect its for key values in itertools.groupby heapq.merge its if len list values len its yield key list intersect..
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