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The definition of a new nametuple creates a large Python script to create the new type. The code stores the code in a private attribute:
 namespace = dict(__name__='namedtuple_%s' % typename)
 exec(class_definition, namespace)
 result = namespace[typename]
 result._source = class_definition
This attribute wastes memory, I don't understand the purpose of the attribute. It was not discussed in an issue, so I guess that there is no real use case:
changeset: 68879:bffdd7e9265c
user: Raymond Hettinger <python@rcn.com>
date: Wed Mar 23 12:52:23 2011 -0700
files: Doc/library/collections.rst Lib/collections/__init__.py Lib/test/test_collections.py
description:
Expose the namedtuple source with a _source attribute.
Can we just drop this attribute to reduce the Python memory footprint?