[issue9842] Document ... used in recursive repr of containers

[miss-islington]

miss-islington <mariatta.wijaya+miss-islington at gmail.com> added the comment:


New changeset dac5124ba498b51a2c46e2bda751150ae244ed47 by Miss Islington (bot) in branch '3.6':
bpo-9842: Add references for using "..." as a placeholder to the index. (GH-10330)
https://github.com/python/cpython/commit/dac5124ba498b51a2c46e2bda751150ae244ed47


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<https://bugs.python.org/issue9842>
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