years = 2016, 2017, 2018
['data/stocks_{}'.format(year) for year in years]
# ['data/stocks_2016', 'data/stocks_2017', 'data/stocks_2018']df_2016, df_2017, df_2018 = \
[pd.read_csv('stocks_{}.csv'.format(year), index_col='Symbol') \
for year in years]
display(df_2016, df_2017, df_2018)