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class Retry(object):
    """
    Retries function with exponential delay if it's releasing exception.
    """
    def __init__(self, tries, exceptions=None, delay=1, exponent=1.5):
        self.tries = tries
        if exceptions:
            self.exceptions = tuple(exceptions)
        else:
            self.exceptions = (Exception,)
        self.delay = delay
        self.exponent = exponent

    def __call__(self, f):
        def fn(*args, **kwargs):
            exception = None
            for i in range(self.tries):
                try:
                    return f(*args, **kwargs)
                except self.exceptions as e:
                    delay = self.delay * self.exponent ** i
                    if i + 1 == self.tries:
                        raise exception
                    sleep(delay)
                    exception = e
            raise exception
        return fn


"""
Ну и использование такое:

@Retry(3)
def f():
    ...

Повторяет функцию ещё раз (заданное кол-во раз), если функция вернула exception. Каждый раз время увеличивается экспоненциально.
 
"""