old_contents: """Provide the RateLimiter class."""
  import time
  
  
  class RateLimiter(object):
      """Facilitates the rate limiting of requests to reddit.
  
      Rate limits are controlled based on feedback from requests to reddit.
  
      """
  
      def __init__(self):
          """Create an instance of the RateLimit class."""
          self.remaining = None
          self.reset_timestamp = None
          self.used = None
  
      def call(self, request_function, *args, **kwargs):
          """Rate limit the call to request_function.
  
          :param request_function: A function call that returns an HTTP response
          object.
          :param *args: The positional arguments to ``request_function``.
          :param **kwargs: The keyword arguments to ``request_function``.
  
          """
          self.delay()
          response = request_function(*args, **kwargs)
          self.update(response.headers)
          return response
  
      def delay(self):
          """Sleep for an amount of time to remain under the rate limit."""
          if self.remaining is None:
              return
          print(self.remaining)
          print(self.reset_timestamp)
          print(self.used)
          print('---')
  
      def update(self, response_headers):
          """Update the state of the rate limiter based on the response headers.
  
          This method should only be called following a HTTP request to reddit.
  
          Response headers that do not contain x-ratelimit fields will be treated
          as a single request. This behavior is to error on the safe-side as such
          responses should trigger exceptions that indicate invalid behavior.
  
          """
          if 'x-ratelimit-remaining' not in response_headers:
              if self.remaining is not None:
                  self.remaining -= 1
                  self.used += 1
              return
  
          self.remaining = float(response_headers['x-ratelimit-remaining'])
          self.reset_timestamp = (time.time() +
                                  int(response_headers['x-ratelimit-reset']))
          self.used = int(response_headers['x-ratelimit-used'])
  
new_contents: """Provide the RateLimiter class."""
  import time
  
  
  class RateLimiter(object):
      """Facilitates the rate limiting of requests to reddit.
  
      Rate limits are controlled based on feedback from requests to reddit.
  
      """
  
      def __init__(self):
          """Create an instance of the RateLimit class."""
          self.remaining = None
          self.next_request_timestamp = None
          self.used = None
  
      def call(self, request_function, *args, **kwargs):
          """Rate limit the call to request_function.
  
          :param request_function: A function call that returns an HTTP response
          object.
          :param *args: The positional arguments to ``request_function``.
          :param **kwargs: The keyword arguments to ``request_function``.
  
          """
          self.delay()
          response = request_function(*args, **kwargs)
          self.update(response.headers)
          return response
  
      def delay(self):
          """Sleep for an amount of time to remain under the rate limit."""
          if self.next_request_timestamp is None:
              return
          sleep_seconds = self.next_request_timestamp - time.time()
          if sleep_seconds <= 0:
              return
          time.sleep(sleep_seconds)
  
      def update(self, response_headers):
          """Update the state of the rate limiter based on the response headers.
  
          This method should only be called following a HTTP request to reddit.
  
          Response headers that do not contain x-ratelimit fields will be treated
          as a single request. This behavior is to error on the safe-side as such
          responses should trigger exceptions that indicate invalid behavior.
  
          """
          if 'x-ratelimit-remaining' not in response_headers:
              if self.remaining is not None:
                  self.remaining -= 1
                  self.used += 1
              return
  
          now = time.time()
          prev_remaining = self.remaining
  
          self.remaining = float(response_headers['x-ratelimit-remaining'])
          self.used = int(response_headers['x-ratelimit-used'])
          seconds_to_reset = int(response_headers['x-ratelimit-reset'])
  
          if prev_remaining is not None and prev_remaining > self.remaining:
              estimated_clients = prev_remaining - self.remaining
          else:
              estimated_clients = 1.0
  
          if self.remaining == 0:
              self.next_request_timestamp = now + seconds_to_reset
          else:
              self.next_request_timestamp = now + (
                  estimated_clients * seconds_to_reset / self.remaining)
  
subject: Complete an initial version of the RateLimiter code.