How to sent a Visual Selection to an Interactive REPL?

Usecase:

I write/copy paste lot of snippets that needs to be evaluated in REPL . For example the second answer to this questions http://stackoverflow.com/questions/100003/what-is-a-metaclass-in-python .

Problem:
I can do this by copy paste or loading the entire file in REPL but its an overhead sometimes .

Solution ?
What is the simplest way to pass a visual region to a repl in an interactive manner ?

I came across http://stackoverflow.com/questions/7906858/vim-run-selected-code-in-a-persistent-repl-environment.

However what I need is simple way to start a REPL from a VIM Visual selection with stdin as the Visual Input . This sounds way to trivial to be NOT POSSIBLE . How can the visual buffer can be piped into python with no filtering back or handling the output .

For example

Some Other Code

Class Foo():
pass

Some Other Code

I need to be able to select only Class Foo() and enter the REPL with Foo visible in the namespace of the REPL . I have seen many variants like filter back the output etc . But this is more for learning Python Snippets etc and I prefer writing in VIM as opposed to REPL .

PS This Question Is Actually for Python:

I figured that this will work to get a persistent python REPL with stdin in bash :

python -i <(echo "class Foo(object):pass").
Now I can python python -i <(echo "{HERE}")
I can do a <C-R>* there to get my input but it all seems hack .

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