Попробуй вот так.
import quandl
quandl.ApiConfig.api_key = 'e6Rbk-YUCGHVbt5kDAh_'
# get the table for daily stock prices and,
# filter the table for selected tickers, columns within a time range
# set paginate to True because Quandl limits tables API to 10,000 rows per call
data = quandl.get_table('WIKI/PRICES', ticker = ['WMT'],
qopts = { 'columns': ['ticker', 'date', 'adj_close'] },
date = { 'gte': '2015-12-31', 'lte': '2016-12-31' },
paginate=True)
print(data)
Это, наверное, тоже стоит посмотреть.
https://www.quandl.com/api/v3/datasets/EOD/WMT.csv?api_key=your_api_key-oges_here