Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

Don't make KeysView.__repr__ and ValuesView.__repr__ containing the lists of 
all keys and values. This will make the repr of the view of a mapping which is 
a proxy of an external DB containing the full content of that DB, which can be 
gigabytes. See for example rejected issue21670.

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nosy: +serhiy.storchaka

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32300>
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