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' > > # 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() > > # 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? -- http://mail.python.org/mailman/listinfo/python-list
