题解 | #统计运动会项目报名人数#
统计运动会项目报名人数
https://www.nowcoder.com/practice/f992129b6da245d5bc5efb2f95289516
import pandas as pd
import numpy as np
items = pd.read_csv("items.csv", sep=",")
signup = pd.read_csv("signup.csv", sep=",")
merged = pd.merge(
items,
signup,
how="inner",
on="item_id",
left_on=None,
right_on=None,
left_index=False,
right_index=False,
sort=True,
suffixes=("_x", "_y"),
copy=True,
)
print(merged[merged["item_id"].notnull() == True].groupby("item_name")['employee_id'].count())