image_output_1.png
import pandas as pd # data processing, CSV file I/O (e.g. pd.read_csv)

calendar_df = pd.read_csv('../input/m5-forecasting-accuracy/calendar.csv', parse_dates=['date'], usecols=['date', 'd'])
calendar_stv = calendar_df[:1913]

sales_train_validation = pd.read_csv('../input/m5-forecasting-accuracy/sales_train_validation.csv', index_col='id')
sales_train_validation.head()