On 29/10/2013 16:54, Tim Chase wrote:
I've got some decorators that work fine as such:
@dec1(args1)
@dec2(args2)
@dec3(args3)
def myfun(...):
pass
However, I used that sequence quite a bit, so I figured I could do
something like
dec_all = dec1(args1)(dec2(args2)(dec3(args3)))
to consolidate the whole mess down to
@dec_all
def myfun(...):
pass
However, this yields different (test-breaking) results. Messing
around, I found that if I write it as
dec_all = lambda fn: dec1(args1)(dec2(args2)(dec3(args3)(fn)))
it works and passes all preexisting tests.
What am I missing that would cause this difference in behavior?
If you apply the stacked decorators you get:
myfun = dec1(args1)(dec2(args2)(dec3(args3)(myfun)))
If you apply dec_all you get:
myfun = dec1(args1)(dec2(args2)(dec3(args3)))(myfun)
See the difference? You need the lambda to fix that.
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