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[英]Appending a pandas.DataFrame to one column of another pandas.DataFrame
[英]Pandas.DataFrame: Create a new column, using one column from current df and by looking up one column in another df, with calculation
嗨,我是 python / Pandas 的新用户。 请帮助我处理 Pandas.DataFrame (也许还有应用方法)。 我有两个DataFrame,示例如下。 我想通过查找每个产品的单价乘以 df_products['Qty Sold'] 来创建一个新列 df_products['Sales Revenue']。 我该如何正确地做到这一点? 谢谢你。
# Pandas DataFrame example questions
import pandas as pd
products = ({
'Product': ['A', 'B', 'C', 'D'],
'Qty Sold': [10, 15, 22, 40]
})
prices =({
'Product': ['A', 'B', 'C', 'D', 'E', 'F', 'G'],
'Unit Price': [3.20, 3.40, 2.20, 11.00, 8.05, 9.30, 4.00]
})
df_products = pd.DataFrame(product)
df_prices = pd.DataFrame(prices)
df_products
**Product** **Qty Sold** **Sales Revenue**(to create)
0 A 10 =10*3.20
1 B 15 =15*3.40
2 C 22 ........
3 D 40 ........
df_prices
Product Unit Price
0 A 3.20
1 B 3.40
2 C 2.20
3 D 11.00
4 E 8.05
5 F 9.30
6 G 4.00
df_products['Sales Revenue'] = df_products['Qty Sold'].mul(df_prices['Unit Price'])
df_merged = df_products.merge(df_prices, on = 'Product')
df_products['销售收入'] = df_merged['销售数量'] * df_merged['单价']
或者:
df_products['Sales Revenue'] = df_products.merge(df_prices, on = 'Product')['Qty Sold']*df_products.merge(df_prices, on = 'Product')['Unit Price']
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