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imom0/count.py

Created November 19, 2012 04:21
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Count tuple-key dict element appearence
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count.py
# url http://stackoverflow.com/questions/13447226/count-how-many-times-a-part-of-a-key-appears-in-a-dictionary-python
from collections import Counter
from itertools import chain
a = { (1,2):3, (1,3):5, (2,1):6 }
# first
# nested iter, order is important
Counter(j for k in a for j in k)
# second
# use chain of itertools
Counter(chain(*a.keys()))
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