Yeah I know. Maybe "force" is not the right word ... probably "discourage"?

Actually only one line of code is enough for each of map/filter:

    def map(fn, seq): return [fn(each) for each in seq]
    def filter(cond: seq): return [each for each in seq if cond(each)] 

But seriously, what do you really gain by removing these two? Isn't that too ideological? I don't really see how un-Pythonic it would be to use map/filter instead of list comprehensions. The problem is BDFL's attitude seems to drive many FP-ers away, like the guy in the original post.