Hi All
I've not posted to this list before. Hello!
I have a question about decorators and have failed to devise a search that has
thrown up any history of discussion on this particular matter.
Does the following seem like something that 'should' work? Or is anyone aware
of a source of documentation that explains historically why the following
syntax might not be allowed?
I hope this sort of conundrum/discussion-point is appropriate to this forum;
I'm not on python-dev and this is obviously not a bug.
So..
Decorator grammar is this:
decorator: '@' dotted_name [ '(' [arglist] ')' ] NEWLINE
The grammar prevents this:
>>> class MyDecorator:
... def decorator_method():
... pass
...
>>> @MyDecorator().decorator_method()
File "<stdin>", line 1
@MyDecorator().decorator_method()
^
SyntaxError: invalid syntax
But is possible to achieve the desired effect by assigning the class instance
to variable:
>>> mydecorator = MyDecorator()
... @mydecorator.decorator_method
... def f():
My initial thoughts were that the syntax provided a neat way to provide a
configurable decorator class instance with a number of alternative
decorator-function generating methods, rather than just the usual __call__.
S
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