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As we said, comprehensions compiled into functions. That means | Python etc

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]