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按配送距离分组分析配送费与时长

未完成
中级参考 代码结构已给出，请填写 ____ 处 
def solve():
    from pyodide.http import open_url
    from io import StringIO
    import pandas as pd
    deliveries=pd.read_csv(StringIO(open_url(____).read()))
    orders=pd.read_csv(StringIO(open_url(____).read()))
    merged=deliveries.merge(____)
    merged['____']=pd.cut(____)
    by_bucket=merged.groupby(____).agg(count=(____),avg_fee=(____),avg_dur=(____)).round(____)
    print(____)
    for bucket,row in by_bucket.iterrows():
        print(____)

示例

输入
solve()
期望输出
Delivery by distance bucket:
  <1km: count=18 avg_fee=4.6 avg_dur=17.2min
  1-2km: count=25 avg_fee=4.5 avg_dur=21.5min
  2-3km: count=42 avg_fee=4.4 avg_dur=26.4min
  3-5km: count=62 avg_fee=5.9 avg_dur=31.1min
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