Canonical conversion of dict of dicts to list of dicts
Greg Ewing
greg.ewing at canterbury.ac.nz
Thu Apr 1 02:32:32 EDT 2021
On 31/03/21 7:37 pm, dn wrote:
> Python offers mutable (can be changed) and immutable (can't) objects
> (remember: 'everything is an object'):
> https://docs.python.org/3/reference/datamodel.html?highlight=mutable%20data
While that's true, it's actually irrelevant to this situation.
> $ a = "bob"
> $ b = a
> $ b = "bert"
> $ a
> 'bob'
Here, you're not even attempting to modify the object that is
bound to b; instead, you're rebinding the name b to a different
object. Whether the object to which b was previously bound is
mutable or not makes no difference.
You can see this if you do the equivalent thing with lists:
>>> a = ["alice", "bob", "carol"]
>>> b = a
>>> b
['alice', 'bob', 'carol']
>>> b = ['dave', 'edward', 'felicity']
>>> a
['alice', 'bob', 'carol']
>>> b
['dave', 'edward', 'felicity']
--
Greg
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