Python tries to move away from functional idioms whenever the developers realize that the idiom can be severed from the paradigm. E.g. Python's switch from filter(list, p) to [x for x in list if p]. Guido van Rossum feels that the imperative way is easier to understand and so do I.

Functional programming languages have good ideas, like type systems or lazy evaluation. But many of these ideas are NOT INHERENT to the paradigm. Perl6 incorporates almost every functional programming idea but as an imperative language.