PEP 285: Adding a bool type

[Alex Martelli]

Lulu of the Lotus-Eaters wrote:

> |the Lotus-Eaters wrote:
> |>    fs = (can_be_moved, can_be_sized, can_be_stacked,
> |>          can_be_coloured, can_be_hidden)
> |>    major = len([1 for f in fs if f(o)]))
> 
> |from operators impor add
> |fs = ...
> |major = reduce(add, [f(o) for f in fs])
> 
> Well... my version is two bytes shorter :-) (more if you count the extra
> import).

I personally prefer:

major = len(filter(None, [f(o) for f in fs]))

but I understand your reluctance to mix older features, such as filter,
with newer ones, such as list comprehension, when the latter can do
the job by themselves.  With old features only:

major = len(filter(None, map(apply, fs, len(fs)*[o])))

is arguably a bit clunky.  However, both of these filter-based
alternatives share the advantages of your solution vs Magnus'.


Alex