On 4/19/2012 7:20 AM, Alek Storm wrote:
Why not use list comprehension syntax?
For 3.x, that should be shortened to "Why not use comprehension
syntax?", where comprehensions by default become generator expressions.
These:
> Map: [val+1 for val in some_list]
> Filter: [val for val in some_list if val > 0]
become
> Map: (val+1 for val in some_list)
> Filter: (val for val in some_list if val > 0)
as map and filter produce iterators, just like comprehensions
interpreted as generator expressions.
functions (reduce() was removed from 3.0 for reasons I will never
understand).
The signature of Python's reduce is defective* because it combines two
versions of reduce (2 and 3 arg forms) into one function in a way that
makes it confusing and hard to use and therefore less used than it might
be otherwise. So it was moved (not removed) to the functools module.
* One consistent signature that people could remember would be
reduce3(update(current,next), initial_current, source_of_nexts)
--
Terry Jan Reedy
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