I don't know if it is useful but it is an interesting
metaprogramming/reflection challenge.
You used `inspect` but you didn't take its full potential. Try to see if
you can simplify your code and see if you can come with a decorator
that does not require special parameters.
from new import NEW
@NEW
... def new_func(a=[]):
... a.append('new appended')
... return a
...
new_func()
['new appended']
new_func()
['new appended']
Spoiler - My solution is at
https://book-of-gehn.github.io/articles/2021/08/14/Fresh-Python-Defaults.html
On Fri, Aug 13, 2021 at 03:44:20PM -0700, guruyaya wrote:
I am fairly sure all of us know about this python quirk:
def no_new_func(a=[]):
... a.append('new')
... return a
no_new_func()
['new']
no_new_func()
['new', 'new']
For some time I was bothered about that there's no elegant way to use empty
list or dict as a default parameter. While this can be solved like this:
def no_new_func(a=None):
... if a == None:
a = []
... a.append('new')
... return a
I have to say I find this solution very far from the spirit of python. Kinda
ugly, and not explicit. So I've decided to try and create a new module, that
will try and make, what I think, is a more beautiful and explicit:
from new import NEW
@NEW.parse
... def new_func(a=NEW.new([])):
... a.append('new appended')
... return a
...
new_func()
['new appended']
new_func()
['new appended']
I'd like to hear your thoughts on my solution and code. You can find and give
your feedback in this project
https://github.com/guruyaya/new
If I see that people like this, I will upload it to pip. I'm not fully sure about the
name I choose (I thought about the "new" keyword used in JAVA, not sure it
applies here as well)
Thanks in advance for your feedback
Yair
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