On 1/26/2014 12:02 PM, Stéfan van der Walt wrote:
> what would the output of
>
> ``group_by((key1, key2))``
I'd expect something named "groupby" to behave as below.
Alan
def groupby(seq, key):
from collections import defaultdict
groups = defaultdict(list)
for item in seq:
groups[key(item)].append(item)
return groups
print groupby(range(20), lambda x: x%2)
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