text: import sys
  from .urllib3 import Urllib3Interceptor
  from .http import HTTPClientInterceptor
  from .base import BaseInterceptor
  
  # Explicit symbols to export
  __all__ = (
      'interceptors', 'add', 'get',
      'BaseInterceptor',
      'Urllib3Interceptor',
      'HTTPClientInterceptor',
      'AIOHTTPInterceptor',
  )
  
  # Store built-in interceptors in pook.
  interceptors = [
      Urllib3Interceptor,
      HTTPClientInterceptor
  ]
  
  # Import aiohttp in modern Python runtimes
  if sys.version_info >= (3, 5, 0):
      try:
          import aiohttp # noqa
          from .aiohttp import AIOHTTPInterceptor
          interceptors.append(AIOHTTPInterceptor)
      except ImportError:
          pass
  
  
  def add(*custom_interceptors):
      """
      Registers a new HTTP client interceptor.
  
      Arguments:
          *custom_interceptors (interceptor): interceptor(s) to be added.
      """
      interceptors.append(*custom_interceptors)
  
  
  def get(name):
      """
      Returns an interceptor by class name.
  
      Arguments:
          name (str): interceptor class name or alias.
  
      Returns:
          interceptor: found interceptor instance, otherwise ``None``.
      """
      for interceptor in interceptors:
          if interceptor.__name__ == name:
              return interceptor
  