Just to nitpick, any language that allows functions 'allows' functional programming to some extent. More seriously, any language with higher order functions, le

Just to nitpick, any language that allows functions 'allows' functional programming to some extent. More seriously, any language with higher order functions, lexical scoping, and closures can be considered appropriate for functional programming. You probably meant languages that are biased primarily towards functional programming, as opposed to others where FP is not the dominant paradigm. You have to specify that much if you are going to include the Lisps but leave Python out.