I have a callable class:
class CallMeMaybe:
__name__ = 'maybe'
def __init__(self):
self.n_calls = 0
def __call__(self):
self.n_calls += 1
raise Exception
That seems to work as advertised:
>>> f = CallMeMaybe()
>>> f.n_calls
0
>>> for i in range(7):
... try:
... f()
... except Exception:
... pass
...
>>> f.n_calls
7
I want to decorate it with an exponential backoff:
from backoff import on_exception, expo
dec = on_exception(expo, Exception, max_tries=3, on_backoff=print)
f = CallMeMaybe()
f2 = dec(f)
Now it looks like attribute access stopped working:
>>> f2.n_calls
0
>>> f2()
{'target': <__main__.CallMeMaybe object at 0xcafef00d>, 'args': (), 'kwargs': {}, 'tries': 1, 'elapsed': 2.1e-05, 'wait': 0.4843249208229148}
{'target': <__main__.CallMeMaybe object at 0xcafef00d>, 'args': (), 'kwargs': {}, 'tries': 2, 'elapsed': 0.484935, 'wait': 1.6524016553598126}
---------------------------------------------------------------------------
Exception Traceback (most recent call last)
... blah blah blah
>>> f2.n_calls
0
My question: who copied n_calls
name into f2
's namespace, and why? Now it holds a stale value - the correct value should be 3:
>>> f2.__wrapped__.n_calls
3