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import pandas as pd

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

walmart_data = pd.read_csv('../input/walmart-sales/Walmart_Store_sales.csv')

walmart_data_groupby = walmart_data.groupby('Store')['Weekly_Sales'].sum()

walmart_data_std = walmart_data.groupby('Store').agg({'Weekly_Sales': 'std'})
print('Store Number {} has maximum Standard Deviation. STD {}'.format(walmart_data_std['Weekly_Sales'].idxmax(), walmart_data_std['Weekly_Sales'].max()))