+
+def retry_method(orig_func):
+ """Provide a default value for a method's num_retries argument.
+
+ This is a decorator for instance and class methods that accept a
+ num_retries argument, with a None default. When the method is called
+ without a value for num_retries, it will be set from the underlying
+ instance or class' num_retries attribute.
+ """
+ @functools.wraps(orig_func)
+ def num_retries_setter(self, *args, **kwargs):
+ arg_vals = inspect.getcallargs(orig_func, self, *args, **kwargs)
+ if arg_vals['num_retries'] is None:
+ kwargs['num_retries'] = self.num_retries
+ return orig_func(self, *args, **kwargs)
+ return num_retries_setter