Multi-isinstance idiom (Re: Deprecate tabs for indenting (was Re: Indenting with tabs vs spaces))

[Fernando Pérez]

Tim Peters wrote:

> [Mike C. Fletcher]
>> ...
>> AFAIK, list comprehensions are basically just syntactic sugar
>> around
>> regular loops, so they aren't likely any faster than a for loop. 
>> If that's changed, it would be good to know.
> 
> They are just sugar, but are nevertheless faster than the for loop
> most sane <wink> people are *likely* to write (the generated code
> uses a bound method object for the hidden list.append, doing the
> method lookup just once before the loop begins).

Can you comment on list comprehensions vs. map? I tend to shy away 
from the convenience of comprehensions because I'm afraid of their 
cost and --at the expense of clarity-- pretty much anything can be 
written with map().

Curious,

F.