famafrench.py 文件源码

def get_available_datasets():
    """
    Get the list of datasets available from the Fama/French data library.

    Returns
    -------
    A list of valid inputs for get_data_famafrench.
    """
    try:
        from lxml.html import parse
    except ImportError:
        raise ImportError("Please install lxml if you want to use the "
                          "get_datasets_famafrench function")

    root = parse(_URL + 'data_library.html')

    l = filter(lambda x: x.startswith(_URL_PREFIX) and x.endswith(_URL_SUFFIX),
               [e.attrib['href'] for e in root.findall('.//a') if 'href' in e.attrib])

    return lmap(lambda x: x[len(_URL_PREFIX):-len(_URL_SUFFIX)], l)