> can anybody point out a situation where you really need
> itertools.filterfalse() ?
Sometimes you get the predicate as a parameter to another function. This way if
you want to filter out things you can easily do it. Other language (such as
Clojure) have a "complement" function that removes the need of filterfalse.
For example (Python 3):
def percent_spam(is_spam, documents):
n_spam = sum(1 for _ in filter(is_spam, documents))
n_ham = sum(1 for _ in filterfalse(is_spam, documents))
return float(n_spam) / (n_ham + n_spam)
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