[Python-ideas] Re: PEP 472 - slices in keyword indices, d[x=1:3]

[tcphone93]

My suggestion to solve this would be to use a similar rule to the walrus 
operator; only allow slice literals within either `()` brackets or `[]` square 
brackets; thus `{a: b: c: d, x: y}` becomes illegal and would need to be 
`{(a:b): (c:d), x: y}`
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