[docs] [issue18301] In itertools.chain.from_iterable() there is no cls argument

[Terry J. Reedy]

Terry J. Reedy added the comment:

My counter proposal #18752 is that chain.from_iterable become a deprecated alias for a new function, chain_iterable.  With '@classmethod' removed, the current Python equivalent would work for chain_iterable.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18301>
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