application_vnd.jupyter.stderr_output_1.png
import pandas as pd

df_train = pd.read_csv('prediction_challenge/covid19-global-forecasting-week-4/train.csv')

test_province_country_groups = df_train.groupby(['Province_State', 'Country_Region'])
province_country_groups = df_train.groupby(['Province_State', 'Country_Region'])

df_train.isnull().sum()

df_train.loc[df_train['Province_State'].isnull(), 'Province_State'] = 'None'
df_train.isnull().sum()