[issue26809] `string` exposes ChainMap from `collections`

[SilentGhost]

SilentGhost added the comment:

I wouldn't say it matter, "from configparser import _ChainMap" works too, but that's just how imports work in Python. There is not reason to do what you've done on purpose - ChainMap is undocumented and is clearly just a detail of implementation.

The fact that ChainMap pollutes namespace when doing star import ("from string import *"), however, is unfortunate. I believe there was an issue around that was supposed to add missing __all__, but I'm not able to find that issue atm.

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nosy: +SilentGhost, georg.brandl

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<http://bugs.python.org/issue26809>
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