comprehensions are functions

As we said, comprehensions compiled into functions. That means, we can take a types.CodeType object for a comprehension, wrap it into types.FunctionType, and get a function.

import types

def make():
    [x*2 for x in _]

code = make.__code__.co_consts[1]
func = types.FunctionType(code, globals())

# call the function!
func(iter(range(5)))
# [0, 2, 4, 6, 8]