[Python] Convert a bound method in python to a function (and reduce arg count)

I am adding a URL handler to a Flask application using add_url_rule. It requires a function as a handler (not a method). However, for proper encapsulation, my intended function is a bound method that uses the self variable. Is there any way I can somehow make Flask see my function: def action(self, param) as def action(param) ?

class A():
def __init__(self):
self._localvar = 5
self._flask = Flask("testapp")

def add_rules(self):
self._flask.add_url_rule("/","root",????)

def action(self, value):
print("The value is {}".format(self._localvar))

def run(self):
self._flask.run()

app = A()
app.add_rules()
app.run()


what I want to do is replace ???? with app.action, a bound method. However, add_url_rule expects a function. I tried app.action.__func__ and app.action.im_func which are function pointers. However, the function signature is still going to require self and will give me a runtime error.

My current solution is to have some loose functions in my module and have app just use them directly, but it just seems that there has to be a cleaner way since the handlers are really tightly coupled to the app object and I don't want them floating around outside of it.

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