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        resp = requests.get(url, stream=True)
        with open('save_file', 'wb') as save_file:
            for chunk in tee(resp, save_file):
                # do stuff with chunk

    .. code-block:: python

        import io

        resp = requests.get(url, stream=True)
        fileobject = io.BytesIO()

        for chunk in tee(resp, fileobject):
            # do stuff with chunk

    :param response: Response from requests.
    :type response: requests.Response
    :param fileobject: Writable file-like object.
    :type fileobject: file, io.BytesIO
    :param int chunksize: (optional), Size of chunk to attempt to stream.
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        resp = requests.get(url, stream=True)
        for chunk in tee_to_file(resp, 'save_file'):
            # do stuff with chunk

    :param response: Response from requests.
    :type response: requests.Response
    :param str filename: Name of file in which we write the response content.
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        This uses the :meth:`bytearray.extend` by default instead of passing
        the bytearray into the ``readinto`` method.

    Example usage:

    .. code-block:: python

        b = bytearray()
        resp = requests.get(url, stream=True)
        for chunk in tee_to_bytearray(resp, b):
            # do stuff with chunk

    :param response: Response from requests.
    :type response: requests.Response
    :param bytearray bytearr: Array to add the streamed bytes to.
    :param int chunksize: (optional), Size of chunk to attempt to stream.
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