On 21/03/2019 17:06, Antoine Pitrou wrote:
On Fri, 22 Mar 2019 03:42:00 +1100
Steven D'Aprano <st...@pearwood.info> wrote:
For those who oppose the + operator, it will help me if you made it
clear whether it is *just* the + symbol you dislike, and would accept
the | operator instead, or whether you hate the whole operator concept
regardless of how it is spelled.
I'd rather see a method. Dict merging just doesn't occur often enough
that an operator is desirable for it.
Analogous to the relationship between list.sort() and sorted(), I can't
help but think that a dict.merge() method would be a terrible idea. A
merged() function is more defensible.
And to those who support this PEP, code examples where a dict merge
operator will help are most welcome!
I don't use Python often enough to have much to offer, I'm afraid. The
sort of occasion I would use dict merging is passing modified
environments to subcommands. Something like:
def process():
if time_to_do_thing1():
thing1(base_env + thing1_env_stuff + env_tweaks)
if time_to_do_thing2():
thing2(base_env + thing2_env_stuff + env_tweaks)
...and so on. The current syntax for doing this is a tad verbose:
def process():
if time_to_do_thing1():
env = base_env.copy()
env.update(thing1_env_stuff)
env.update(env_tweaks)
thing1(env)
del env
if time_to_do_thing2():
env = base_env.copy()
env.update(thing2_env_stuff)
env.update(env_tweaks)
thing2(env)
del env
--
Rhodri James *-* Kynesim Ltd
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