[issue19218] Use of MutableMapping in os module slows down interpreter startup

[Christian Heimes]

Christian Heimes added the comment:

The io module no longer imports collections.abc through the locale module.

Eric, I'm with Antoine. Your patch is too much of a clever hack and uses tricks that are dark magic. _abcoll is much simpler and easier to understand. Plus it can be used from other modules, too.

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<http://bugs.python.org/issue19218>
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