如何将熊猫数据帧的两列相乘（行乘法）并将结果存储在新列中？

Question

Command

df_main['Ranking'] = df_main['Porosity']*['Permeability'] gives -

TypeError: can't multiply sequence by non-int of type 'str'

The attacehd picture ( https://i.stack.imgur.com/0Asu3.png ) has more information. My code snippet is at i.stack.imgur.com/ehqF5.png)

More info: https://i.stack.imgur.com/0Asu3.png

Answer 1

First you need to convert the column type of the two columns to floats (otherwise you cannot multiply them). You can do that as follows:

df_main[['Porosity', 'Permeability']] = df_main[['Porosity', 'Permeability']].astype(float)

Then you can define the new column via multiplication:

df_main['Ranking'] = df_main['Porosity']*df_main['Permeability']