On 1/26/2011 9:04 AM Jack Bates said...
Am struggling to understand Python method-to-instance binding
Anyone know why this example throws a TypeError?
> #!/usr/bin/env python
>
> import functools
>
> # Take a generator function (i.e. a callable which returns a generator) and
> # return a callable which calls .send()
> class coroutine:
> def __init__(self, function):
> self.function = function
>
> functools.update_wrapper(self, function)
>
> def __call__(self, *args, **kwds):
> try:
> return self.generator.send(args)
>
> except AttributeError:
> self.generator = self.function(*args, **kwds)
>
> return self.generator.next()
>
> # Each time we're called, advance to next yield
> @coroutine
> def test():
> yield 'call me once'
> yield 'call me twice'
define test
>
> # Works like a charm : )
> assert 'call me once' == test()
> assert 'call me twice' == test()
>
> class Test:
>
> # Each time we're called, advance to next yield
> @coroutine
> def test(self):
> yield 'call me once'
> yield 'call me twice'
>
> test = Test()
I'm not sure, but you've shadowed the test function above here.
>
> # TypeError, WTF?
> assert 'call me once' == test.test()
> assert 'call me twice' == test.test()
https://gist.github.com/797019
Am trying to write a decorator such that each time I call a function, it
advances to the next "yield" - I plan to use functions like this as
fixtures in tests
Does a decorator like this already exist in the Python standard library?
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