Implement logic on object.attribute and object.attribute()

Chris Angelico rosuav at gmail.com
Sun Nov 24 15:37:12 CET 2013


On Mon, Nov 25, 2013 at 1:16 AM, Marc Aymerich <glicerinu at gmail.com> wrote:
> ...     def do_get(self):
> ...         # Do a HTTP GET request.
> ...         return "Get stuff"
> ...     def do_put(self):
> ...         # Do a HTTP PUT request.
> ...         return "Put stuff"

To make this a bit more realistic, try this instead - tying in with
what I said in response to Roy:

class CallableString(str):
    # Like a string, but callable.
    def function(self):
        raise NotImplementedError(
                "this must be overridden on the instance"
                )
    def __call__(self):
        return self.function()


class Magic_HTTP_Thing:
    @property
    def attribute(self):
        result = CallableString(self.do_get())
        result.function = lambda: self.do_put()
        return result
    def do_get(self):
        # Do a HTTP GET request.
        print("Doing the GET call, please wait...")
        time.sleep(1)
        return "Get stuff"
    def do_put(self):
        # Do a HTTP PUT request.
        print("Doing the PUT call, please wait...")
        time.sleep(1)
        return "Put stuff"

(PUT or POST, makes no difference; I think you were looking for POST,
but Steven wrote PUT here so I'll use that for simplicity)

>>> Magic_HTTP_Thing().attribute()
Doing the GET call, please wait...
Doing the PUT call, please wait...
'Put stuff'

And that's what you don't want happening. Your PUT / POST calls are
going to take twice as long as they should.

ChrisA



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