Victor Hooi <victorh...@gmail.com> writes:
> What is the currently most Pythonic way for doing deep comparisons
> between dicts?
What distinction do you intend by saying “deep comparison”? As
contrasted with what?
> For example, say you have the following two dictionaries
>
> a = {
> 'bob': { 'full_name': 'bob jones', 'age': 4, 'hobbies': ['hockey',
> 'tennis'], 'parents': { 'mother': 'mary', 'father', 'mike'}},
> 'james': { 'full_name': 'james joyce', 'age': 6, 'hobbies': [],}
> }
>
> b = {
> 'bob': { 'full_name': 'bob jones', 'age': 4, 'hobbies': ['hockey',
> 'tennis']},
> 'james': { 'full_name': 'james joyce', 'age': 5, 'hobbies': []}
> }
Those two dicts are not equal. How would your intended “deep comparison”
behave for those two values?
> However, this page seems to imply that cmp() is deprecated?
> https://docs.python.org/3/whatsnew/3.0.html#ordering-comparisons
It is, yes.
> Should we just be using the equality operator ("==") instead then? E.g.:
>
> a == b
Yes. That is a comparison that would return False for comparing the
above two values. Would you expect different behaviour?
> What is the reason for this?
I don't really understand. ‘cmp’ is deprecated, and you can compare two
dicts with the built-in operators. That's the reason; are you expecting
some other reason?
> Or is there a better way to do this?
I don't really know what it is you want to do. What behaviour different
from the built-in comparison operators do you want?
--
\ “I went over to the neighbor's and asked to borrow a cup of |
`\ salt. ‘What are you making?’ ‘A salt lick.’” —Steven Wright |
_o__) |
Ben Finney
--
https://mail.python.org/mailman/listinfo/python-list
