Steven D'Aprano added the comment:
They don't do the same thing.
The dict comprehension requires a single key:value pair per loop. It
accumulates values into a single dict. Try this:
d = {}
for key, value in items:
print(id(d))
d[key] = value
The ID doesn't change
New submission from Luke Davis :
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():
