On 2015-01-24 19:55, Chris Angelico wrote:
On Sun, Jan 25, 2015 at 5:56 AM, Ethan Furman <et...@stoneleaf.us> wrote:
If the non-generic is what you're concerned about:
# not tested
dispatch_table_a = {}
dispatch_table_b = {}
dispatch_table_c = {}
class dispatch:
def __init__(self, dispatch_table):
self.dispatch = dispatch_table
def __call__(self, func):
self.dispatch[func.__name__] = func
return func
@dispatch(dispatch_table_a)
def foo(...):
pass
That's still only able to assign to a key of a dictionary, using the
function name. There's no way to represent fully arbitrary assignment
in Python - normally, you can assign to a name, an attribute, a
subscripted item, etc. (Augmented assignment is a different beast
altogether, and doesn't really make sense with functions.) There's no
easy way to say "@stash(dispatch_table_a['asdf'])" and have that end
up assigning to exactly that.
Here's a slight variation on the theme:
class DispatchTable(dict):
def __call__(self, name):
def setter(func):
self[name] = func
return func
return setter
command = DispatchTable()
@command("foo")
def _(*args):
print("You asked to foo.")
@command("bar")
def _(*args):
print("There's no wine in the bar.")
@command("asdf")
def _(*args):
print("Asdf! Asdf!")
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