[New-bugs-announce] [issue42723] Unclear why dict unpacking cannot be used in dict comprehension

[Luke Davis]

New submission from Luke Davis <lukedavis at live.com>:

Why am I unable to do:

dict = { **sub_dict for sub_dict in super_dict.values() }

which throws: "dict unpacking cannot be used in dict comprehension"

Whereas the equivalent code below doesn't throw any errors?:

dict = {}
for sub_dict in super_dict.values():
    dict = { **dict, **sub_dict }

Am I wrong in thinking the first and second block of code should do the same thing behind the scenes?

----------
messages: 383641
nosy: PartlyFluked
priority: normal
severity: normal
status: open
title: Unclear why dict unpacking cannot be used in dict comprehension
type: enhancement

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42723>
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