[issue21678] Add operation plus for dictionaries
New submission from Михаил Мишакин:
First of all, i'm sorry for my English :)
I would like to union dictionaries with operator + (and +=) like this:
dict(a=1, b=2) + {'a': 10, 'c': 30}
{'a': 10, 'b': 2, 'c': 30}
d = dict(a=1, b=2, c={'c1': 3, 'c2': 4})
d += dict(a=10, c={'c1':30})
d
{'a': 10, 'b': 2, c: {'c1':30}}
Also, it gives an easy way to modify and extend the class attributes:
class Super:
params = {
'name': 'John',
'surname': 'Doe',
}
class Sub(Super):
params = Super.params + {
'surname': 'Show',
'age': 32,
}
--
components: Interpreter Core
messages: 219867
nosy: Pix
priority: normal
severity: normal
status: open
title: Add operation plus for dictionaries
versions: Python 3.4
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[issue21678] Add operation plus for dictionaries
STINNER Victor added the comment: You should use dict.update() method. -- nosy: +haypo ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue21678 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue21678] Add operation plus for dictionaries
Михаил Мишакин added the comment: Is's like list's operation + and it's method list.extend(). But dict have no operation +... If I have two lists (A and B), and I want to get third list (not change A and B) i do this: C = A + B If I have two dicts, i can do this: C = dict(A, **B) But if i have three dictionaries, code becomes this: C = dict(A, **dict(B, **D)) Don't you think, that + is more comfortable? A = [1, 2, 3] B = [4, 5] C = [6, 7] A + B + C = [1,2,3,4,5,6,7] I can do this with list, tuples and strings. Why i can't do this with dictionaries? -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue21678 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue21678] Add operation plus for dictionaries
Terry J. Reedy added the comment: This has been proposed, discussed on both python-list and python-ideas, and rejected more than once because there are there are multiple possible response to multiple keys: keep first value, keep second value (.update), keep both (in a list), or keep neither and raise. 'Obvious' ideas like this should be floated on one of those two lists to find out past response. -- nosy: +terry.reedy resolution: - rejected stage: - resolved status: open - closed type: - enhancement versions: +Python 3.5 -Python 3.4 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue21678 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
