benchmarks.py 文件源码

def format_yahoo_index_url(symbol, start_date, end_date):
    """
    Format a URL for querying Yahoo Finance for Index data.
    """
    return (
        'http://ichart.finance.yahoo.com/table.csv?' + urlencode({
            's': symbol,
            # start_date month, zero indexed
            'a': start_date.month - 1,
            # start_date day
            'b': start_date.day,
            # start_date year
            'c': start_date.year,
            # end_date month, zero indexed
            'd': end_date.month - 1,
            # end_date day
            'e': end_date.day,
            # end_date year
            'f': end_date.year,
            # daily frequency
            'g': 'd',
        })
    )