06计算列

import pandas as pd
books  = pd.read_excel('e:/Books.xlsx',index_col='ID') 
for i in books.index:
    books['Price'].at[i]=books['ListPrice'].at[i]*books['Discount'].at[i]
print(books)

import pandas as pd
books  = pd.read_excel('e:/Books.xlsx',index_col='ID')

books['ListPrice']=books['ListPrice'].apply(lambda x:x+2)  #也可定义函数 
print(books)