> (1) building another throwaway list and
> (2) function call overhead for calling doit()
>
> You can avoid (1) by using filter() instead of map()
Are you sure of this? My python returns, when asked for help(filter) :
Help on built-in function filter in module __builtin__:
filter(...)
filter(function or None, sequence) -> list, tuple, or string
Return those items of sequence for which function(item) is true. If
function is None, return the items that are true. If sequence is a tuple
or string, return the same type, else return a list.
I'm afraid there is no builtin function to do an inplace modification
of a sequence...
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