Steven D'Aprano <steve+pyt...@pearwood.info> added the comment:
Hi Jacob, and welcome.
You said: "I was experimenting with nested dictionaries when I came across
strange behavior that I can not figure out at all."
This is a bug tracker, for reporting bugs, not a help desk for asking how to
figure out Python's behaviour. Python is 30 years old and what you are calling
"strange" has exactly how Python has worked for all that time. Sorry to tell
you, but it is your understanding that is lacking, not a bug in the language.
I can't really tell why you think it is "strange" -- I've been using Python for
20 years or so, and I'm not sure what you think is weird about this, it all
seems perfectly natural to me. I'm having difficulty in seeing why you expect
something different, sorry.
This bug tracker is not the right place to get into a long discussion about
Python's behaviour. There are plenty of other places, like the Python-List
mailing list, or StackOverflow, or Reddit's r/learnpython. But I *guess* that
maybe you expect that when you call your function
input_into_nested_dict(m, y, 'hello')
that the dict `m` is copied before being passed to the function? If that's what
you think is happening, let me assure you that no it is not. Python never
copies data structures unless you explicitly tell it to, and specifically
assignment does not make copies either.
So when you say `cdip = dictionary`, that doesn't make a copy of the input
dict, it is just a new name for the original global dict.
These may help you:
https://nedbatchelder.com/text/names1.html
https://www.youtube.com/watch?v=_AEJHKGk9ns
Good luck!
----------
nosy: +steven.daprano
resolution: -> not a bug
stage: -> resolved
status: open -> closed
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue40639>
_______________________________________
_______________________________________________
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
