Adam Jorgensen wrote: > Hi all, I'm experiencing a weird issue with closuring of parameters > and some nested functions I have inside two functions that > return decorators. I think it's best illustrated with the actual code:
You should have made an effort to reduce its size > # This decorator doesn't work. For some reason python refuses to > closure the *decode_args parameter into the scope of the nested > decorate and decorate_with_rest_wrapper functions > # Renaming *decode_args has no effect > def rest_wrapper(*decode_args, **deco_kwargs): > def decorate(func): > argspec = getfullargspec(func) > decode_args = [argspec.args.index(decode_arg) for decode_arg > in decode_args] I didn't read the whole thing, but: >>> def f(a): ... def g(): ... a = a + 42 ... return a ... return g ... >>> f(1)() Traceback (most recent call last): File "<stdin>", line 1, in <module> File "<stdin>", line 3, in g UnboundLocalError: local variable 'a' referenced before assignment Python treats variables as local if you assign a value to them anywhere in the function. The fix is easy, just use another name: >>> def f(a): ... def g(): ... b = a + 42 ... return b ... return g ... >>> f(1)() 43 In Python 3 you can also use the nonlocal statement. -- http://mail.python.org/mailman/listinfo/python-list
