Raymond Hettinger added the comment:
Sorry, this is just how expression lists work. See Grammar/Grammar at
https://hg.python.org/cpython/file/tip/Grammar/Grammar
This is really no different than:
for [k] is s: ...
or:
[k, j] = s
> Why not set literals
Because sets are unordered and because it isn't needed.
----------
nosy: +rhettinger
resolution: -> not a bug
stage: -> resolved
status: open -> closed
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<http://bugs.python.org/issue30402>
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