import pandas as pd
import datetime
from pandas_datareader import data as web

start = datetime.datetime(2010, 1, 1)
end = datetime.datetime(2015, 8, 22)

df = web.DataReader(("google", "yahoo", start, end))

print(df)



--------------------------------------------------
    "data_source=%r is not implemented" % data_source)
NotImplementedError: data_source=None is not implemented