586. Customer Placing the Largest Number of Orders.md

586. Customer Placing the Largest Number of Orders

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Soluton

import pandas as pd

def largest_orders(orders: pd.DataFrame) -> pd.DataFrame:
    a=orders.groupby(['customer_number'])['order_number'].nunique().reset_index()
    a=a[a['order_number']==a['order_number'].max()]
    return a[['customer_number']]