NamedTuple._replace()

NamedTuple has some public functions starting with an underscore, see https://docs.python.org/2/library/collections.html

When I try to use them, mypy complains with

error: "MyType" has no attribute "_replace"

This should be fixed in the repo already, in #1810. You should be able to install straight from the repo, like this:

pip3 install -U git+git://github.com/python/mypy.git

Thanks, sorry didn't see that.

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