10_DataFrame的运算

1. DataFrame与标量运算,标量与每个元素进行计算
   • df * 2

2. DataFrame与DataFrame运算,根据标签索引进行对位计算，索引没有匹配上的用NaN填充。

   • df1 + df2

importpandasaspdimportnumpyasnpimportmatplotlib.pyplotasplt# DataFrame与标量运算,标量与每个元素进行计算。df=pd.DataFrame(data={"age":[20,30,40,10],"name":["张三","李四","王五","赵六"]},columns=["name","age"],index=[101,104,103,102],)print('=======')print(df)print('=======')print(df*2)# DataFrame与DataFrame运算,根据标签索引进行对位计算，索引没有匹配上的用NaN填充。df1=pd.DataFrame(data={"age":[10,20,30,40],"name":["张三","李四","王五","赵六"]},columns=["name","age"],index=[101,102,103,104],)df2=pd.DataFrame(data={"age":[10,20,30,40],"name":["张三","李四","王五","田七"]},columns=["name","age"],index=[102,103,104,105],)print(df1+df2)