商品名称 单价 进价 华为手机 4000 3500 Hp电脑 8000 7500 利用MapReduce编程框架编写程序统计每种商品的销售情况,统计出利润最高和销量最好的商品。
时间: 2024-02-10 12:40:25 浏览: 20
假设销售数据已经按照一定格式存储在一个大型文本文件中,每一行表示一次销售记录,包含商品名称、销售价格和进货价格。可以按照以下步骤完成利润和销量的统计:
1. Map阶段:将每一行数据按照商品名称作为Key,将销售价格和进货价格作为Value,输出<Key, Value>对。
2. Reduce阶段:对于每一个Key,将其对应的所有记录的Value相加,得到该商品的总销售额和总进货成本。利用这两个值计算该商品的总利润和总销量。
3. 再次Map阶段:将每一个商品的名称作为Key,将其销售额和销量作为Value,输出<Key, Value>对。
4. 再次Reduce阶段:对于每一个Key,将其对应的所有记录的Value相加,得到该商品的总销售额和总销量。根据这两个值可以计算该商品的平均销售价格和平均进货价格,以及利润率和销售量。
5. 根据统计结果,选出利润最高和销量最好的商品。
示例代码如下(假设输入文件路径为input.txt,输出文件路径为output.txt):
```python
from mrjob.job import MRJob
from mrjob.step import MRStep
class SalesAnalysis(MRJob):
def steps(self):
return [
MRStep(mapper=self.mapper_profit,
reducer=self.reducer_profit),
MRStep(mapper=self.mapper_sales,
reducer=self.reducer_sales),
MRStep(mapper=self.mapper_summary,
reducer=self.reducer_summary),
MRStep(mapper=self.mapper_top,
reducer=self.reducer_top)
]
def mapper_profit(self, _, line):
fields = line.strip().split()
product = fields[0]
sales = float(fields[1])
cost = float(fields[2])
yield product, (sales, cost)
def reducer_profit(self, product, values):
total_sales = 0.0
total_cost = 0.0
for sale, cost in values:
total_sales += sale
total_cost += cost
profit = total_sales - total_cost
yield product, (total_sales, total_cost, profit)
def mapper_sales(self, product, values):
total_sales, total_cost, profit = values
yield product, (total_sales, 1)
def reducer_sales(self, product, values):
total_sales = 0.0
total_count = 0
for sale, count in values:
total_sales += sale
total_count += count
avg_price = total_sales / total_count
yield product, (total_sales, total_count, avg_price)
def mapper_summary(self, product, values):
total_sales, total_count, avg_price = values
yield None, (product, total_sales, total_count, avg_price)
def reducer_summary(self, _, values):
top_profit = ('', 0.0)
top_sales = ('', 0)
for product, total_sales, total_count, avg_price in values:
profit_rate = total_sales / avg_price
if profit_rate > top_profit[1]:
top_profit = (product, profit_rate)
if total_count > top_sales[1]:
top_sales = (product, total_count)
yield 'profit', top_profit[0]
yield 'sales', top_sales[0]
def mapper_top(self, category, product):
yield category, product
def reducer_top(self, category, products):
top_product = max(products)
yield category, top_product
if __name__ == '__main__':
SalesAnalysis.run()
```
在命令行中执行以下命令即可运行程序:
```bash
python sales_analysis.py input.txt -o output.txt
```
输出文件output.txt中会包含利润最高和销量最好的商品名称。