code: def retry(tries, delay=3, backoff=2):
      
  
      if backoff <= 1:
          raise ValueError("backoff must be greater than 1")
  
      tries = math.floor(tries)
      if tries < 0:
          raise ValueError("tries must be 0 or greater")
  
      if delay <= 0:
          raise ValueError("delay must be greater than 0")
  
      def deco_retry(f):
          def f_retry(*args, **kwargs):
              mtries, mdelay = tries, delay
  
              rv = f(*args, **kwargs)  # first attempt
              while mtries > 0:
                  if rv is True:
                      return True
  
                  mtries -= 1
                  time.sleep(mdelay)
                  mdelay *= backoff
  
                  rv = f(*args, **kwargs)  # Try again
              print str(tries) + " attempts. Abandoning."
              return False  # Ran out of tries
  
          return f_retry
  
      return deco_retry
docs: Retries a function or method until it returns True.