Hongbao Chen wrote:
Hey, guys
I must argue that make **kwargs sorted is really a terrible idea. Please think that when user wants a unsorted **kwargs, how can he or she bring the original unsorted dict back?
Despite the subject line, this is not about a *sorted* dict, but about an *ordered* dict. The difference is that an ordered dict remembers the order that elements are given:
pairs = list(zip('cat', (1,2,3))) pairs [('c', 1), ('a', 2), ('t', 3)]
dict(pairs) # order is lost {'a': 2, 'c': 1, 't': 3}
from collections import OrderedDict as odict odict(pairs) # but ordered dicts keep it OrderedDict([('c', 1), ('a', 2), ('t', 3)])
The problem is that keyword args are collected in an ordinary dictionary, which is unordered, so you lose the original order (except by accident):
odict(c=1, a=2, t=3) OrderedDict([('a', 2), ('c', 1), ('t', 3)])
So there is currently no way for functions to have arbitrary keyword arguments supplied in the order in which they were passed, because the order is lost when they are collected in a dict. -- Steven