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import pandas as pd

import pandas as pd # data processing, CSV file I/O (e.g. pd.read_csv)

train_df = pd.read_csv('../input/covid19-global-forecasting-week-4/train.csv')
test_df = pd.read_csv('../input/covid19-global-forecasting-week-4/test.csv')

pop_info = pd.read_csv('../input/population-by-country-2020/population_by_country_2020.csv')

pop_info.rename(columns={'Density (P/Km²)': 'Density'}, inplace=True)

pop_info.columns