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P238 Q1&Q2
Q1：
原代码：
def get_month_data(data):
sale = (data['Price']*data['Qty']).sum()
traffic = data['sheetID'].drop_duplicates().count()
s_t = sale/traffic
return (sale,traffic,price)
sale_1,traffic_1,s_t_1 = get_month_data(This_data)
sale_2,traffic_2,s_t_2 = get_month_data(last_data)
sale_3,traffic_3,s_t_3 = get_month_data(same_data)
会出现 This data 无法定义的问题的，
后将This_data改为This_month，下同
出现KeyError：Price
标签无法定义问题，后怀疑是变量过多且定义不明确，进行修改。
Q2：columns = ['本月累计','上月同期','去年同期'] 后面缺少逗号,
请作者大大批评指正~