How does a function know the docstring of its code object?

Date	2011-09-15 12:10 +0100
Subject	How does a function know the docstring of its code object?
From	Arnaud Delobelle <arnodel@gmail.com>
Newsgroups	comp.lang.python
Message-ID	<mailman.1161.1316085061.27778.python-list@python.org> (permalink)

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Hi all,

You can do:

def foo():
    "foodoc"
    pass

function = type(lambda:0)
foo2 = function(foo.__code__, globals())
assert foo2.__doc__ == "foodoc"

I am wondering how the function constructor knows that foo.__code__
has a docstring.  I can see that

    foo.__code__.co_consts == ('foodoc',)

But I can't find where in foo.__code__ is stored the information that
the first constant in foo.__code__ is actually a docstring.

-- 
Arnaud

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How does a function know the docstring of its code object? Arnaud Delobelle <arnodel@gmail.com> - 2011-09-15 12:10 +0100

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