统计各小时订单量找出外卖高峰时段

def solve():
    from pyodide.http import open_url
    from io import StringIO
    import pandas as pd
    orders=pd.read_csv(StringIO(open_url(____).read()))
    orders['____']=pd.to_datetime(____).dt.hour
    by_hour=orders.groupby(____).size().reset_index(____)
    print(____)
    for _,r in by_hour.nlargest(____,'____').iterrows():
        print(____)
    print(____)