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python Programming Glossary: collections.defaultdictHow to solve the “Mastermind” guessing game? http://stackoverflow.com/questions/1185634/how-to-solve-the-mastermind-guessing-game of times those keys are present def multiset vals multiset collections.defaultdict int for val in vals multiset val 1 return multiset Secondly.. evens 1 odds . def partition S func args kwargs partition collections.defaultdict set for v in S partition func v args kwargs .add v return partition..
How to initialize a dict with keys from a list and empty value in Python? http://stackoverflow.com/questions/2241891/how-to-initialize-a-dict-with-keys-from-a-list-and-empty-value-in-python a classmethod so it works for dict subclasses like collections.defaultdict as well. The optional second argument specifies the value to..
Pythonic Way to reverse nested dictionaries http://stackoverflow.com/questions/2273691/pythonic-way-to-reverse-nested-dictionaries python list comprehension share improve this question collections.defaultdict makes this pretty simple from collections import defaultdict..
Multiple levels of 'collection.defaultdict' in Python http://stackoverflow.com/questions/2600790/multiple-levels-of-collection-defaultdict-in-python folks on SO I discovered the possibilities offered by collections.defaultdict notably in readability and speed. I have put them to use with..
In a Python dict of dicts, how do you emulate Perl's auto-vivification behavior? http://stackoverflow.com/questions/3122566/in-a-python-dict-of-dicts-how-do-you-emulate-perls-auto-vivification-behavior like the following import collections def hasher return collections.defaultdict hasher hash hasher hash 'element1' 'sub1' 'subsub1' 'value1'..
Memory Efficient Alternatives to Python Dictionaries http://stackoverflow.com/questions/327223/memory-efficient-alternatives-to-python-dictionaries single array code import collections def build file pairs collections.defaultdict list for line in file # N.B. file assumed to be already sorted..
python : getting rid of extra line: http://stackoverflow.com/questions/3348460/python-getting-rid-of-extra-line as f data list csv.reader f import collections counter collections.defaultdict int for row in data counter row 10 1 with open ' pythonwork..
Use cases for the 'setdefault' dict method http://stackoverflow.com/questions/3483520/use-cases-for-the-setdefault-dict-method cases for the 'setdefault' dict method The addition of collections.defaultdict in Python 2.5 greatly reduced the need for dict 's setdefault.. What popular use cases of setdefault were superseded with collections.defaultdict python dictionary setdefault share improve this question..
In Python, when to use a Dictionary, List or Set? http://stackoverflow.com/questions/3489071/in-python-when-to-use-a-dictionary-list-or-set you couldn't import collections or in pre 2.7 Python as a collections.defaultdict int using the items as keys and the associated value as the..
python backports for some methods http://stackoverflow.com/questions/3785433/python-backports-for-some-methods for the following methods to work with python 2.4 any all collections.defaultdict collections.deque python methods backport share improve this..
http://stackoverflow.com/questions/4098131/matplotlib-update-a-plot to the figure. def plots global vlgaBuffSorted cntr result collections.defaultdict list for d in vlgaBuffSorted result d 'event' .append d result_list..
how do i rewrite this function to implement OrderedDict? http://stackoverflow.com/questions/4126348/how-do-i-rewrite-this-function-to-implement-ordereddict el item None if el.text item el.text child_dicts collections.defaultdict list for child in el.getchildren child_dicts child.tag .append..
Check if a given index already exists in a dictionary and increment it http://stackoverflow.com/questions/473099/check-if-a-given-index-already-exists-in-a-dictionary-and-increment-it share improve this question You are looking for collections.defaultdict available for Python 2.5 . This from collections import defaultdict..
Django template can't loop defaultdict http://stackoverflow.com/questions/4764110/django-template-cant-loop-defaultdict 'Smith' 'firstname' 'shawn' 'lastname' 'Spencer' new_data collections.defaultdict list for d in data new_data d 'lastname' .append d 'firstname'..
Python group by array a, and summarize array b - Performance http://stackoverflow.com/questions/7538382/python-group-by-array-a-and-summarize-array-b-performance a which have small length and big or small values using a collections.defaultdict would probably be faster. Edit See J.F. Sebastian's solution..
Determining Letter Frequency Of Cipher Text In Python http://stackoverflow.com/questions/992408/determining-letter-frequency-of-cipher-text-in-python share improve this question import collections d collections.defaultdict int for c in 'test' d c 1 print d # defaultdict type 'int' 's'..
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