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Tue Apr 4 20:26:17 CEST 2006 · https://mail.python.org/pipermail/python-dev/2006-April/063398.html

[Alex] 
> This is quite general and simple at the same time: for example, it  
> was proposed originally to answer some complaint about any and all  
> giving no indication of the count of true/false items:
> 
> tally(bool(x) for x in seq)
> 
> would give a dict with two entries, counts of true and false items.

FWIW, sum() works nicely for counting true entries:

    >>> sum(x%3==0 for x in range(100))
   34

Raymond

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[Python-Dev] tally (and other accumulators)