New submission from Ashwini Chaudhary:
Currently
namedtuple(https://hg.python.org/cpython/file/3.5/Lib/collections/__init__.py#l418)
sets the `__module__` attribute by looking up `__name__` in calling frame's
globals. As in the case of `typing.NamedTuple` it is always going to be
'typing' pickle will raise an error.
Instead of this `typing.NamedTuple` should override the `__module__` attribute
itself because it has info about the actual caller frame.
Something like this should work fine:
```
def NamedTuple(typename, fields):
fields = [(n, t) for n, t in fields]
cls = collections.namedtuple(typename, [n for n, t in fields])
cls._field_types = dict(fields)
try:
cls.__module__ = sys._getframe(1).f_globals.get('__name__', '__main__')
except (AttributeError, ValueError):
pass
return cls
```
Related: http://stackoverflow.com/q/33796490/846892
----------
components: Library (Lib)
messages: 254883
nosy: montysinngh
priority: normal
severity: normal
status: open
title: typing.NamedTuple instances are not picklable.
versions: Python 3.5
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Python tracker <[email protected]>
<http://bugs.python.org/issue25665>
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